American Society for MicrobiologyClinical and Vaccine Immunology

American Society for MicrobiologyClinical and Vaccine Immunology

virus [vi´rus] any member of a unique class of infectious agents, which were originally distinguished by their smallness (hence, they were described as “filtrable” because of their ability to pass through fine ceramic filters that blocked all cells, including bacteria) and their inability to replicate outside of and without assistance of a living host cell. The acetate and hydrochloride salts are used in dietary supplementation and the hydrochloride salt is used in the treatment of severe metabolic alkalosis refractory to treatment.lysine (lī′sēn′, -sĭn) n. A virus consists of genetic material, which may be either DNA or RNA, and is surrounded by a protein coat and, in some viruses, by a membranous envelope. When it occurred to Margulies’ graduate researcher that Williams Sonoma might have the answer to their prayers, it was a major breakthrough for the lab’s efforts to treat one of America’s most prevalent sexually transmitted diseases. Specimens showing discordant results were tested by HSV type-specific Western blotting (WB). For example, the Antennapedia (Antp) gene in Drosophila normally controls leg development, but misexpression of this gene in the developing antenna transforms it into a leg. As in nevi sebaceus, the basaloid epidermal proliferation overlying a dermatofibroma often shows a form of follicular stromal induction suggesting a recapitulation of hair follicle growth.

Defining the pathway of viral invasion may lead to new targets for anti-viral therapy. We are delighted by their diversity. It can be anything from a band on a gel to a complete chromosome. Enveloped viruses draw on cellular machinery and materials to generate copies of their genome, structural proteins, and membrane. The prevalence of HSV-1 infection increases with age, and >70% of adults worldwide are seropositive for the virus (18). Some IR results from radioactive decay of naturally-occurring radioactive compounds. During the early 1980�s it was simultaneously postulated in France and America that AIDS was the consequence of infection with a special class of virus called a retrovirus.

Finally, we identify the viral cyclin D ortholog as a major pathogen-encoded factor contributing to the MAPK/CDK signature of the infected cell phosphoproteome. However, in instances of subclinical or unrecognized HSV infection, serologic testing for immunoglobulin G (IgG) antibodies to type-specific HSV glycoprotein G (gG) may be useful. G.; Nurse, P (1987). Minimal media are those that contain the minimum nutrients possible for colony growth, generally without the presence of amino acids, and are often used by microbiologists and geneticists to grow “wild type” microorganisms. Genes that are connected in such a way form genetic interaction networks. The Frenulum Labii Inferioris is the frenulum of the lower lip. This approach is similar to traditional EIA but allows for the simultaneous detection and identification of multiple analytes in a single reaction tube.

The function meninges is cover and protect the blood vessel that supply at brain and contains cerebrospinal fluid (CSF) between the pia mater and arachnoid mater. The basic mechanism is the same but there are some subtle differences. Since 2008, three multiplex flow immunoassays (AtheNA Multi-Lyte [Zeus Scientific], BioPlex 2200 [Bio-Rad Laboratories], and Plexus HerpeSelect [Focus Diagnostics]) have received FDA clearance for the detection and differentiation of IgG class antibodies to HSV-1 and HSV-2. Many viruses have striking geometrically regular shapes, with helical structure as in tobacco mosaic virus, polyhedral (often icosahedral) symmetry as in herpes virus, or more complex mixtures of arrangements as in large viruses, such as the pox viruses and the larger bacterial viruses, or bacteriophagesbacteriophage , virus that infects bacteria and sometimes destroys them by lysis, or dissolution of the cell. Due to increasing test volumes (∼105% in the past 3 years) and the limitations of conventional methods for HSV antibody testing (e.g., limited throughput and labor-intensive testing), we undertook a study to evaluate and compare the AtheNA, BioPlex, and Plexus multiplex assays for the detection and differentiation of IgG class antibodies to HSV-1 and HSV-2. They are not visible through a light microscope. The helper functions of Ad were extensively characterized and demonstrated to be supplied by the E1a, E1b-55K, E2a, and E4Orf6 genes, and by the VA RNAs [3].

Specimens showing discordant results after initial testing were repeated by EIA and all three multiplex assays, with further discrepancies being evaluated by gG type-specific WB (University of Washington, Seattle, WA). Louckes is an EBV-negative Burkitt’s B-lymphoma cell line. Placental membrane separating the blood in the fetal capillaries from the maternal blood in the intervillous space. The HerpeSelect EIA uses microwells coated with recombinant gG-1 (molecular mass, 35 to 45 kDa) or gG-2 (80 to 110 kDa) antigens. It is also possible for the DNA of some viruses to be incorporated into the host cell DNA, producing a carrier state. Multiplex flow immunoassays.In addition to testing by EIA, each specimen was tested by the AtheNA, BioPlex 2200, and Plexus HSV-1 and HSV-2 IgG multiplex assays according to the manufacturers’ instructions. Few viruses produce toxins, although viral infections of bacteria can cause previously innocuous bacteria to become much more pathogenic and toxic.

The principle of MFI technology has been reviewed previously (17, 23). In brief, the Athena Multi-Lyte HSV-1 and HSV-2 IgG Plus (Zeus Scientific) assay was performed on an automated immunoassay multiplexing system (AIMS) instrument (Inverness Medical, Princeton, NJ). This technique also is useful in assessing the role of proteins identified solely on the basis of DNA sequence. The nodules of tumor show a peripheral palisade of basaloid cells and, at their interface with the stroma, slit-like retraction is seen (arrow) (b). Experiments were conducted with wild-type virus or deletion mutants harvested from complementing cells. Certainly that is consistent with recent changes in the relative prevalence of stress-related disorders among men and women, given that there have been no changes in the basic biological differences between the genders. This means it is possible for one Bioseq to have feature tables from several different sources, or a feature table and set of alignments.
American Society for MicrobiologyClinical and Vaccine Immunology

Specifically, we studied the laboratory-adapted AD-169 strain of HCMV, which is restricted to growth in fibroblasts, and whose metabolic effects have been previously studied [6], [10]. These internal controls verify the addition of patient sample to the reaction mixture, the absence of nonspecific binding, and the performance of the detector. In parallel, ATM/ATR signaling enhances repair by inducing DNA-repair-proteins transcriptionally or post-transcriptionally; by recruiting repair factors to the damage; and by activating DNA-repair proteins by modulating their phosphorylation, acetylation, ubiquitylation or sumoylation27. Almost half of the heterosexual women infected with HIV were apparently infected by sexual contact with an IDU�s. Together, these data and analyses provide a novel systems-level resource to better inform and enable studies of pathogen-host interactions. Testing by the Plexus HerpeSelect assay was performed on a Janus (Perkin Elmer, Waltham, MA) liquid handling system. R.

(2004). Techniques may be biased, i.e. ^ “Labium Superius Oris — Medical Definition”. Testing by WB was blinded to the results of EIA and MFI and was performed and interpreted at the University of Washington Virology Laboratory as previously described (5). This is happened when infected pigs move into the new outbreaks areas. Timing and reproducibility studies.The average assay time for testing with each multiplex system was obtained by timing two separate runs (both 90 and 180 specimens/run) from the time the samples were placed on the instrument until the final results of the run were calculated. Intra-assay reproducibility for both HSV-1 and HSV-2 results were performed by testing a single positive sample 20 times on each platform.

(see recombinationrecombination, process of “shuffling” of genes by which new combinations can be generated. In addition to analyzing the agreement of qualitative results (positive or negative), the mean index value, standard deviation (SD), and percent coefficient of variation (CV) were also determined. Statistics.Statistical analyses were performed using JMP software, version 7 (SAS Institute, Inc., Cary, NC). Altogether this work represents the first comprehensive study recapitulating the series of early events that take place during HSV-1-induced AAV replication. Result agreement by kappa values was categorized as near perfect (0.81 to 1.0), substantial (0.61 to 0.8), moderate (0.41 to 0.6), fair (0.21 to 0.4), slight (0 to 0.2), or poor ( 0.81) with conventional testing by EIA. In situ hybridization (ISH) was performed as previously described (16). The membrane must be applied properly without wrinkles and changed as often as necessary to prevent excess accumulation of fluid and bacteria under it.

(16) evaluated the AtheNA HSV-1 and HSV-2 multiplex assay, using 332 serum specimens, with the results showing agreements of 93.4% (310/332 specimens) and 94.9% (315/332 specimens), respectively, with testing by HerpeSelect EIA (16). human T-lymphotropic virus (HTLV) either of two related species of retroviruses that have an affinity for the helper cell type of T lymphocytes. This difference may be due to the larger sample size tested in our study or, potentially, to lot-to-lot variation in assay reagents used between the two studies. HTLV-2 has been isolated from an atypical variant of hairy cell leukemia and from patients with other hematological disorders, but no clear association with disease has been established. Further testing of these specimens by WB showed that 5/34 specimens (14.7%) were positive (n = 2) or equivocal (n = 3) for IgG class antibodies to HSV-2 (Table 2). This study has several limitations. To address this problem, mouse geneticists have devised a clever technique using site-specific DNA recombination sites (called loxP sites) and the enzyme, called Cre, that catalyzes recombination between them.

Metatypical BCC: histomorphology. Although Tg does not significantly reduce cell viability at a concentration of 10 μM, it is known to have pleiotropic effects on cell function, including inhibition of protein synthesis at concentrations as low as 30 nM (Soboloff and Berger, 2002), and for this reason, Tg was not included. look at something largely neglected until now: G × E interactions at the favorable end of the continuum (above-average reading and attention). If GIBB-mod = mitochondrial and GIBB-mod = complete are both present in Seq-descr, then we know this is a complete mitochondrial genome. The strongest contributor to the generic infection response is dTTP, whose upregulation is consistent with the shared need of both viruses to replicate their DNA. In conclusion, we have demonstrated that the AtheNA, BioPlex, and Plexus multiplex immunoassays show high overall agreement with routine testing by EIA, while offering several advantages. These repeats are normally generated by the ribonucleoprotein complex, telomerase but in some cancer cells they are maintained by HR-based “alternative lengthening of telomeres” (ALT) mechanisms38.

The constitutional symptoms listed above become unremitting. MAPK3/ERK1 and MAPK substrate c-Jun also were exclusive to infected cells. Third, intra- and interassay reproducibility studies showed excellent precision for each system, with 100% agreement for qualitative results among runs. “Role of CDK/cyclin complexes in transcription and RNA splicing”. Our data showed that testing on the BioPlex instrument resulted in a >50% reduction in turnaround time compared to that for EIA (1.5 h [BioPlex] versus 3.1 h [EIA] for 90 specimens). Front. ^ Valsiner, Jaan (2000).

The kits and reagents used in this study were provided by Bio-Rad Laboratories, Focus Diagnostics, and Zeus Scientific.

You may also like

American Society for MicrobiologyClinical and Vaccine Immunology

American Society for MicrobiologyClinical and Vaccine Immunology

Human herpesvirus 6 (HHV-6) is closely related to HHV-7 in terms of genome organization and sequence. 1986), after which many laboratories independently isolated other strains of HHV-6 (Agut et al. The antibody prevalence was constantly high at 90% from the age of 8 months up to the 71-80 years group, and it only decreased in the age group over 80. The sensitivity of the assay for the diagnosis of heterophile antibody-negative EBV IM was 86.2%. Most healthy adults carry the virus and are asymptomatic; infection results in lifelong persistence. He developed increasing confusion, pulmonary infiltrates and neutropenia. Nevertheless, HA may be absent, particularly in young children (14) but also in as many as 20% of adults with EBV IM (7).

The study was conducted from July 1995 to February 1996 at Metro-McNair Clinical Laboratories and Children’s Hospital, both in Vancouver, British Columbia, Canada. Along with ES, HHV-7 infections have been associated with sporadic cases of pityriasis rosea, hepatitis, neurological manifestations and transplant complications (Black & Pellett 1999). Date Last Changed 20020510 Date last changed, in the format YYYYMMDD Change Type MIN Change Type Code DEL = delete (deprecate) ADD = add NAM = change to Analyte/Component (field #2); MAJ = change to name field other than #2 (#3 – #7); MIN = change to field other than name UND = undelete Status ACTIVE ACTIVE = Concept is active. Use at will. These results document that vIL-6 does not bind IL-6R and suggest that conformational change may be critical to vIL-6 function. Use with caution as the concept and associated attributes may change. DISCOURAGED = Concept is not recommended for current use.

New mappings to this concept are discouraged; although existing may mappings may continue to be valid in context. Twenty percent of the patients in that study had an IgG seroconversion to HHV-6, indicating that primary HHV-6 infection can be misdiagnosed as measles or rubella. Serum samples were stored at −20°C immediately after separation and were retrieved for further analysis. Nevertheless, major phenotypic and functional changes also occur in nonproductively infected cells, as observed in professional antigen-presenting cells such as mononuclear phagocytes and dendritic cells (DC) (). VCA IgG avidity studies were performed by following a previously published protocol (6, 8, 12). In brief, VCA IgG avidity was determined with the VCA IgG EIA (Captia), with the first wash step modified to include two washes (five minutes each) with a washing buffer containing urea (8 M). Although testing for Roseoloviruses in the setting of typical exanthem subitum is generally not indicated, quick and accurate diagnosis could play a role in stemming antimicrobial overuse, minimizing unnecessary hospitalization, informing potential utility of selective treatment, and advancing understanding of the clinical impact of primary infection ().

IgG avidity index values less than 50% were considered compatible with a recent primary EBV infection (8). In our experience, sera from patients with a remote EBV infection (VCA IgG positive [VCA IgG+]/EBNA-1 IgG+/VCA IgM−/HA-negative) give VCA IgG avidity values greater than 75%, whereas those for sera from patients with demonstrated recent primary EBV infection (VCA IgM+/VCA IgG+/EBNA-1 IgG+/HA-positive) are less than 50% (data not shown). HA were detected by a differential agglutination assay (I.M. kit; Microgen, Surrey, Great Britain). Parvovirus B19-specific IgG and IgMs were detected by an EIA from Biotrin International (Dublin, Ireland). Cytomegalovirus (CMV)-specific IgG and IgM antibodies were detected by the respective Architect or Axsym CMV assay (Abbott Diagnostics, IL). IgG and IgM antibodies to human herpesvirus-6 (HHV-6) were detected by an EIA from Panbio (Queensland, Australia).

For all EIAs, interpretation of the results was made according to the instructions of the respective manufacturer. IMFA.The IMFA (flowthrough device) is based on an assay principle in which the sample and a variety of reagent and wash solutions are sequentially absorbed through a porous membrane containing spots or lines of immobilized analyte-specific or control antibodies (reviewed in reference 17). The Immunoquick Filtration EBV M assay (referred to as the IMFA herein) was performed by following the instructions of the manufacturer (BioSynex Immunodiagnostic, Strasbourg Cedex, France). Briefly, a volume of 25 μl of serum was diluted in 1.5 ml of dilution buffer in a plastic tube. The diluted sample was then poured directly from the tube into the device window and allowed to drain for 15 s. The CBMCs were then infected with 25 μl of virus preparation (in 10-fold dilution series) and incubated for 7 days at 37°C in a 5% CO2 incubator. The washing buffer (1.5 ml) was added next, and the reaction was read as soon as the buffer was fully drained through the device window.

The appearance of test 1 (T1) (ZEBRA synthetic peptide) and control (immobilized protein A) blue bands indicated the presence of ZEBRA-specific IgM antibodies. The appearance of the control band in the absence of the T1 band indicated a negative result, while the absence of both bands invalidated the test. The results of the tests were interpreted independently by three observers. Viral cultures of CSF and stool for enterovirus were negative. Detection of EBV DNA in serum.A commercial herpesvirus multiplex real-time PCR assay (RealCycler HHHH-0; Progenie Molecular, Valencia, Spain), carried out with the SmartCycler instrument (Cepheid, Sunnyvale, CA), was used for the detection of EBV DNA in sera (200 μl). For this assay, HHV-6 was grown in an immature T-cell line (HSB-2). (2008).

Group A (n = 24) consisted of sera obtained from patients with acute (early) primary EBV infection (VCA IgG−, VCA IgM+, EBNA-1 IgG−, follow-up serum specimens showing VCA IgG seroconversion, clinical manifestations compatible with EBV IM, and absence of IgM antibodies to CMV, HHV-6, and parvovirus B19). Eleven of the 24 sera tested positive in the HA assay; the median age of patients (15 males and 9 females) belonging to this group was 4 years (range, 1 to 16 years). Bound protein was detected with polyclonal rabbit antibodies directed against vIL-6 or hIL-6 (Peprotech) at 1 μg/mL, followed by an HRP-conjugated antirabbit IgG (Bio-Rad) at 1:3000 in PBS/0.05% Tween 20. The median age of patients in this group was 6 years (range, 3 to 8 years). Group E (n = 20) consisted of sera drawn from patients (10 females and 10 males) displaying an equivocal EBV-specific antibody profile (VCA IgG+, VCA IgM+, and EBNA-1 IgG+) compatible with either late primary EBV infection or subclinical EBV reactivation. Three of these sera tested positive in the HA assay. Convalescent-phase serum samples were tested only if no activity was detected in the acute-phase sample.
American Society for MicrobiologyClinical and Vaccine Immunology

None of these sera tested positive in the CMV-, HHV-6-, and parvovirus B19-specific IgM assays. In addition, it has recently been suggested that HHV-6A infection suppresses T-cell proliferation by inducing G2/M arrest in infected T cells [37]. Ten of these sera were seronegative for EBV, four sera displayed an EBV serological profile compatible with a past EBV infection, and one serum sample was VCA IgG+, VCA IgM−, and EBNA-1 IgG−. None of these sera tested positive in the HA assay. Previously, ciHHV-6 detection required fluorescence in situ hybridization, a labor-intensive procedure with limited availability, or HHV-6 PCR testing of hair follicle cells [38], an atypical sample type for many molecular diagnostics labs. Performance of the IMFA with sera from patients with acute EBV IM.Twenty-one sera from patients in the early phase of acute IM (group A) tested positive (four sera gave a weak positive result) in the IMFA (Table 1). The remaining three sera tested negative in the IMFA, the EBV DNA assay, and the HA test.

Twenty-one sera from patients with acute EBV IM (group B) tested positive in the IMFA. The other two sera tested negative in the IMFA and in the EBV DNA assay and displayed VCA IgG avidity index values around 50%. One of the two sera was found to be positive in the HA test. The diagnostic efficacy of the IMFA for sera lacking heterophile antibodies was assessed. Twenty-five of the 47 sera in groups A and B tested negative in the HA assay (Table 2). IgMs to ZEBRA were detected by the IMFA in 21 of the 25 sera. The four nonreactive samples tested negative in the EBV DNA assay.

One of these serum specimens tested positive for VCA IgGs and had a VCA IgG avidity index value of 48%. All of the 22 sera testing positive in the HA test gave a positive result in the IMFA. Performance of the IMFA with sera from susceptible and non-acutely EBV-infected individuals.None of the sera obtained from either EBV-seronegative individuals (group C) or individuals with a past EBV infection (group D) yielded a positive reaction in the IMFA. The lysis buffer (20 mM Tris, 0.5 M NaCl, and 0.5% Nonidet P-40, pH 7.5) was added to each pellet at four times the pellet volume. This serological profile is frequently detected in routine EBV-specific antibody testing and may be observed either in the late phase of acute IM or in the setting of EBV reactivation. Thirteen of the 20 sera tested positive (11 reacted weakly) in the IMFA (Table 1). As shown in Table 3, 6 of the 13 sera positive by the IMFA had VCA IgG avidity index values greater than 50% and tested negative in both the EBV DNA assay and the HA test.

These sera gave a weak positive signal in the IMFA. In transplant patients, numerous disease associations with HHV-6 reactivation have been reported. Four and three of the 7 sera tested positive in the EBV DNA assay and in the HA test, respectively. There was significant interaction between age and percent atypical lymphocytes/lymphocytes, showing that these factors were not independent in the model. Consistent with these findings, we examined a one-year old child with a recent HHV-6 infection and HHV-7 DNA, suggesting the occurrence of a co-infection. Performance of the IMFA with sera from patients with a mononucleosis-like syndrome caused by other viruses.Fifteen sera from patients with primary symptomatic infections owing to CMV, HHV-6, or parvovirus B19 (group F) were tested in the IMFA. Two out of the 15 sera were found to be reactive.

There could be several reasons for the different degrees of neutralizing efficiency, including the possibility that the mAbs recognize somewhat different epitopes within the region of Asp81 to Cys93, that while mapping to the same epitopes, the different mAbs exert variable activity for binding and neutralization,35 or that the differences may be related to the integrity of the antibody molecules. The other serum specimen had a serological profile compatible with a primary EBV infection (VCA IgG+, VCA IgM−, and EBNA-1 IgG−) and also tested negative in the EBV DNA assay. No sufficient volume of these sera was available for VCA IgG avidity analysis. Sensitivity and specificity of the IMFA.For the calculation of the sensitivity and specificity of the IMFA, the following criteria were adopted: (i) the sera included in groups A and B (n = 47) and those in group E that yielded low VCA IgG avidity index values and/or tested positive in the EBV DNA assay and that belonged to patients with clinical features of acute IM (n = 7) were considered true positives for the diagnosis of EBV IM and (ii) the sera in groups C and D (n = 20), which displayed EBV-specific antibody profiles compatible with past EBV infection or no EBV infection, and 14 of the 15 sera from patients with primary infection owing to other viruses (from group F; the serum specimen displaying the VCA IgG+, VCA IgM−, and EBNA-1 IgG− EBV-specific antibody profile was excluded because of the possibility of an EBV and HHV-6 coinfection) were considered true negatives for the diagnosis of EBV IM. To determine if the 101K activity was specific or due to cross-reactivity, cross-adsorption studies were performed using measles-, rubella-, and HHV-6-infected cell antigen. The availability of a rapid, easy-to-perform, sensitive, and specific antibody assay for the diagnosis of EBV IM would represent a great improvement in EBV serology. Differentiated primary macrophages, stimulated in vitro with IFN-γ and lipopolysaccharide and exposed to either HHV-6A or HHV-6B, fail to produce IL-12, while releasing normal amounts of other soluble factors such as TNF-α, RANTES and MIP-1β [20].

This test attempts to detect IgMs to EBV ZEBRA, a key protein for the initiation of the lytic cycle in EBV-permissive cells (5). IMFAs have been previously shown to perform optimally for the diagnosis of a number of infectious diseases, such as congenital toxoplasmosis and syphilis (10, 19). All of these studies were limited by the use of nested RT-PCR, a sensitive but qualitative molecular method historically prone to false-positive test results. The ZEBRA immunofiltration test was found to be highly sensitive (92.5%) and specific (97.3%) for the diagnosis of EBV IM. In effect, 42 of 47 sera (89.3%) displaying a antibody profile typical of an acute primary EBV infection (VCA IgG+ or VCA IgG−, VCA IgM+, and EBNA-1 IgG−) gave a positive result in the IMFA. This figure is in contrast with that (14%) previously reported by another group (18). The most likely explanation for this discrepancy is the different natures of both the antigens and the immunoassay formats employed (a prokaryotic recombinant ZEBRA protein and a sandwich capture enzyme-linked immunosorbent assay were used in the above-mentioned study, whereas a combination of immunogenic ZEBRA-derived synthetic peptides were employed in the evaluated IMFA in this study).

Five of the 47 sera tested negative in the IMFA. These sera also tested negative in the EBV DNA PCR assay, which has been shown to be frequently positive within the first 3 weeks after the onset of disease (2, 4). In addition, the two sera in which VCA IgGs were detected displayed rather high VCA IgG avidity values (around 50%), indicating that these samples may have been drawn relatively late after the onset of infection, once IgMs to ZEBRA had already been cleared. A remarkable feature of the IMFA was its performance with sera testing negative in the HA assay. The sensitivity of the IMFA in HA-negative sera was 86.2%, which makes it particularly valuable for the diagnosis of EBV IM in young children. The IMFA was found to be highly specific, not only when sera from either EBV-seronegative individuals or individuals with past EBV infection were considered for analysis (none tested positive) but also when sera from patients either remotely infected by EBV or not infected with EBV and displaying a mononucleosis-like syndrome owing to CMV, HHV-6, or parvovirus B19—in which reappearance of VCA IgMs is frequently observed (1, 12, 16)—were evaluated. Two serum specimens in the last group gave a positive result in the IMFA.

One of these sera, however, displayed an EBV-specific antibody pattern compatible with a primary EBV infection (VCA IgG+, VCA IgM−, EBNA-1 IgG−), so that an EBV and HHV-6 coinfection could not be ruled out. 3). A subclinical EBV reactivation concurrent with primary infection by HHV-6 may well explain the reappearance of serum IgMs to ZEBRA in this patient.

You may also like

American Society for MicrobiologyClinical and Vaccine Immunology

American Society for MicrobiologyClinical and Vaccine Immunology

Two hundred seventy-nine serum samples from men attending sexually transmitted disease (STD) clinics in Baltimore, Maryland, were tested for herpes simplex virus type 2 (HSV-2)-specific antibody by three immunosorbent glycoprotein G-2-based assays (the Kalon, Focus, and Biokit assays). HSV-2 prevalence was 2.0%. It came back with: HSV2 IGG INHIBITION,ELISA The HSV-2 IgG screening assay. The Kalon assay performed very well with samples from this population (90.8% sensitive, 99.4% specific), whereas the Focus assay had a sensitivity (82.6%) much lower than that shown previously. A random sample of concordant samples was also tested, and the sensitivities and specificities of the different tests were calculated, taking into account this sampling strategy. The color was light pink and fit the description of. Of 76 patients who were seronegative for HSV-2 by UWWB, 75 were correctly identified by the rapid test.

Unfortunately, we were unable to control for HSV-1 infection status in the regression model, which, on the basis of χ2 analysis, might also affect the clarity of the Biokit test. The recommended index cutoff value of 1.1 for the Focus and Kalon assays was found to be optimal for this population. Herpes simplex virus type 2 (HSV-2) infections increase the likelihood of acquisition of human immunodeficiency virus (HIV) infection, the HIV viral load, and the infectiousness of HIV (21). Western blot, considered a “gold standard” test, is expensive ($156 per test) and difficult to obtain in Kenya. 20 Dec 2014 The test included both the HSV-1 and HSV-2 HerpeSelect IGG test. These assays utilize a variety of target HSV-2 proteins and have had various degrees of success (3). Distinguishing between HSV-1 and HSV-2 infection has been problematic, and assays based on glycoprotein G-2 (gG-2) prove most effective in the detection for antibodies specific to HSV-2 (16).

6 Apr 2015 commercial, FDA-cleared tests like the HerpeSelect ELISA from Focus. CPT Code(s) 86695 (x2), 86696 (x2) Includes. (Lexington, MA) (the Biokit assay), are often cited in the literature (1, 5, 6, 8, 14, 18). Most cases of recurrent genital herpes are caused. The methods discriminate between HSV-1 and HSV-2 infection so that an accurate diagnosis can be performed. The Kalon ELISA for HSV-2 has likewise been shown to perform well, with sensitivity estimates being between 92.3% and 100% and specificities ranging from 97.7% to 100% (15). In the United States alone, it is estimated that 45 million individuals are seropositive for HSV-2 1.

The major benefits of a point-of-care method are that it requires no additional materials beyond the components of the kit and the results can be given to the patient immediately. Would it be indicative at all of what the 16 week test would say? 19 Is IgM Useful in Distinguishing New vs. Infections of HSV-1, HSV-2, and CMV are widespread in the general population and have been the primary candidate viruses whose potential relationship to atherosclerosis has been investigated. Many of the studies that have evaluated the Focus, Kalon, and Biokit assays have been done with sexually transmitted disease (STD) clinic populations; however, these studies generally did not identify the particular STDs present in the population. Finally, many of these exosomes contain cytokines and miRNAs that in turn can effect gene expression in the recipient cells through the classical toll-like receptor and NF B pathway. Performance of Focus ELISA Tests for HSV-1 and HSV-2 Antibodies Among University Students With No History of Genital Herpes.

The Kalon and Biokit assays. Maldeis (14a). All samples were deidentified and stored at −80°C prior to testing. The serum samples were tested for hepatitis C virus (HCV; HCV ELISA; Ortho Raritan, NJ) and HIV (Vironostika HIV-1 ELISA; Biomerieux, Durham, NC). Individuals with connective tissue autoimmune diseases, such as rheumatoid arthritis and systemic lupus erythematosis, and individuals with anti-nuclear antibody may also give false-positive results, as may individuals with other bacterial and viral infections, including Rocky Mountain spotted fever, Epstein-Barr virus, and cytomegalovirus. Testing for the presence of infection by Chlamydia trachomatis, Neisseria gonorrhoeae, Trichomonas vaginalis, or Mycoplasma genitalium was performed with urine samples by the protocols described below. The urine samples were evaluated for the presence of C.

trachomatis and N. gonorrhoeae infections by the Aptima Combo 2 assay (GenProbe, San Diego, CA), and the results for samples with positive results were confirmed with the Aptima CT and Aptima GC confirmatory assays, respectively. Testing for Trichomonas vaginalis was performed by use of the Aptima TMA research assay (GenProbe) and a real-time T. vaginalis PCR assay (Johns Hopkins University, Baltimore, MD) simultaneously (9). A positive result by both assays was required to consider the patient infected with T. vaginalis. Concurrent testing for M.

genitalium was performed by using a multitarget real-time PCR assay (Johns Hopkins University) and a transcription-mediated amplification research assay (GenProbe) (10). The results of both assays were required to be positive for the patient to be considered infected with M. genitalium. HSV-I can take longer to seroconvert when they get HSV-II at a later time. Samples with sufficient remaining sera (n = 279) were further tested for the presence of HSV-2 antibodies by three commercially available immunosorbent assays: the Biokit assay, the Focus assay, and the Kalon assay. Any samples that tested positive or equivocal by an assay for HSV-2 were analyzed for HSV-1 and HSV-2 proteins by Western blotting, which was performed at the University of Washington, Seattle. The Biokit rapid test results are dependent on the subjective judgment of the technician who performs the testing.

Therefore, the results of all Biokit tests were independently reviewed by two technicians for validation. Specimens that had a clearly distinguishable test spot were considered positive, and specimen test devices with no test spot were considered negative (Fig. 1). The results for specimen test devices with faint colorations were considered indeterminate. Additionally, if the technicians disagreed on a test result, it was considered indeterminate. A few methods of interpretation of these faint test spots have been noted, mainly, that they should be considered negative, that the result should be verified by an alternative assay, or that the sample should be retested (22). For the purposes of comparison, a third interpretation, in which faint coloration is considered a positive result, was reviewed.

Focus HSV-2 ELISA and WB were concordant in 339 negative sera and in 356 positive sera; overall 695 (88.9%). Multiple logistic regression analysis was used to assess and quantify the effects of individual STD infections on the indeterminate results of the Biokit assay for HSV-2 for the entire study population. Genital herpes symptoms, or herpes 2, can be a “no show” for quite a while. Positive, indeterminate, and negative results by the Biokit assay for HSV-2. Note that the test spot for a positive result is most often not as bright as the control spot but is still clearly discernible. The sensitivity, specificity, and positive predictive values (PPVs) for all assays were assessed relative to the results of the gold standard assay, Western blotting. Receiver operating characteristics for both the Kalon and the Focus assays were constructed, relative to the results of Western blotting, in order to determine the optimal cutoff values for this population (results not shown).

As noted, the results only for samples that tested positive or indeterminate/equivocal by any assay were confirmed by Western blotting. If standard performance calculations were done by using the results for the entire population, biased estimates of sensitivity and specificity would have resulted (7). Therefore, the sensitivity and the specificity were adjusted on the basis of the proportion of “true disease” in the samples for which confirmatory testing was performed (13). Corresponding intervals were also estimated on the basis of the potential extreme outcomes for the samples for which the results were unconfirmed. PPVs are unaffected by this testing strategy. Samples with atypical Western blotting results (n = 4) were not included in the sensitivity, specificity, and PPV calculations. In addition, we considered serial and parallel algorithms of the three assays in order to improve the overall performance of the testing.
American Society for MicrobiologyClinical and Vaccine Immunology

The 95% confidence interval for the sensitivity and specificity were calculated using an online exact confidence interval for proportion method available at The average age was 26.9 years (standard deviation, 7.6 years). Ninety-seven percent of the study participants were African American; the other 3% were either Caucasian or Asian. The majority of the participants (95%) reported a heterosexual preference. Two hundred seventy-nine subjects had sera available for inclusion in this study. The prevalence of C. trachomatis infection was 20.7% (58/279), that of N.

gonorrhoeae infection was 12.9% (36/279), that of T. vaginalis infection was 3.6% (10/279), and that of M. genitalium infection was 14.3% (40/279). Additionally, 5 of the 279 (1.8%) subjects were HIV-1 positive and 19 (6.8%) were HCV seropositive. A stratification of the aforementioned STDs by HSV-2 serological status is given in Table 1. Of the 279 samples tested for HSV-2 by all three assays, 143 (51.3%) were HSV-2 negative and were not further tested by Western blotting for either HSV-1 or HSV-2. Of the remaining 136 samples, the Western blotting results revealed that 53 were dually positive for HSV-1 and HSV-2, 3 were negative for both viruses, 38 were HSV-1 positive and HSV-2 negative, and 38 were HSV-1 negative and HSV-2 positive.

Of the four atypical HSV-2 samples, one was HSV-1 positive and three were HSV-1 negative. Ninety-one of the 279 individuals were HSV-2 seropositive, for an overall prevalence of 32.6% in this population. A diagram of the outcomes of the assays for HSV-2 by HSV-1- and HSV-2-specific Western blotting results is shown in Fig. 2. HSV-2 serological status of 136 male patients from Baltimore STD clinics, as determined by the Kalon, Focus, and Biokit assays for HSV-2 and as confirmed by Western blotting. HSV-1 serological status was determined solely by Western blotting. Only the data for samples whose results were confirmed by Western blotting are presented.

Note that four samples had atypical HSV-2 Western blot results and those results are not included here. pos, positive; neg, negative. Of the 279 samples tested, 55 (19.7%) samples had indeterminate Biokit test results. Thirty-one of the indeterminate results (56.4%) were HSV-1 positive and HSV-2 negative by Western blotting, 13 (23.6%) were dually positive for HSV-1 and HSV-2, and 7 (12.7%) were HSV-1 negative and HSV-2 positive by Western blotting. Three of the four samples with atypical Western blotting results for HSV-2 were also indeterminate by the Biokit assay. Neisseria gonorrhoeae infection showed a significant effect on the indeterminateness of the Biokit assay for HSV-2. After the other STDs within the population, except for HSV-1, were controlled for, it was found that patients infected with N.

gonorrhoeae were 3.88 times more likely to have an indeterminate Biokit assay result than a clearly positive or a clearly negative test spot (P = 0.001; 95% confidence interval, 1.78, 8.45) (Table 2). Additionally, of the 38 specimens that tested positive for HSV-1 and negative for HSV-2 by Western blotting, only 1 sample (2.6%) had a clear negative result by the Biokit test. If the Biokit test results are stratified by determinate and indeterminate results, an association with HSV-1 serological status is very clear and highly significant (P = 0.003, χ2 test). For this STD clinic population, when four samples with atypical Western blotting results are excluded, it was found that the Focus assay for HSV-2 had a sensitivity much lower (82.6%) than that published previously, but it was still highly specific (Table 3). The Kalon assay performed very well and in accordance with previous performance estimates. Receiver operating characteristic analysis confirmed an optimal index cutoff value of 1.1 for both the Kalon and Focus assays (results not shown). If we consider only the subjects with a determinate Biokit result, the assay performed well, with an overall PPV of 90.9%, but a with compromised sensitivity, estimated to detect only 59.0% of the samples positive for HSV-2 by Western blotting.

If the indeterminate results are treated as negative, as suggested by the manufacturer and as mentioned in the literature, the sensitivity was lowered even further to 48.1% but the specificity of the assay was increased to 94.6% (5). The PPV for this method was still found to be high. If all indeterminate Biokit assay results were treated as positive, the only improvement in performance was seen in sensitivity, which was then estimated to be 64.9%. All estimates of the Biokit assay’s performance within this population fall below previously presented estimates. The Kalon and Focus immunoassays for HSV-2 performed well with samples from the high-prevalence African-American male population studied here, although the sensitivity of the Focus assay was much lower with this population than that noted previously (82.6% compared with 95 to 99%) (20, 22). Assessment of the performance of the Biokit rapid assay for HSV-2 is largely dependent on the interpretation of an indeterminate, faint coloration of the test spot. Of the Biokit assay results for the 279 subjects tested in this study, 19.7% were unclear to the two technicians.

Outside of these ambiguous results, the Biokit assay was fairly specific, although it was not as sensitive as estimated previously. Others have noted similar difficulties in the evaluation and the frequency of faint coloration in near-patient assays for the diagnosis of HSV-2 infection and have cautioned against the overinterpretation of such results, which would cause a decrease in the specificity of the assay compared to that of Western blotting (6, 19). In this study, over half of the subjects with indeterminate Biokit assay results were HSV-1 positive and HSV-2 negative. This significant association suggests a possible cross-reactivity of the kit components with HSV-1-specific antibodies in the absence of IgG specific to HSV-2. Most of these additional indeterminate sera (N = 78) were low positive and most (N = 71) did not confirm by WB. also noted this relationship (17). Conversely, it has been shown that patients who have low-positive index values from the Focus assay for HSV-2 and who are serologically negative for HSV-2 by Western blotting are more likely to have recently seroconverted (11).

Perhaps this faint coloration in the Biokit assay is also a reflection of early infection in these patients. Seroconversion data were not available for analysis in this study. Additionally, there was a significant association between the detection of N. gonorrhoeae in patients and an indeterminate Biokit assay result (odds ratio = 3.88; P = 0.001). This relationship may be due, in part, to the cross-reactivity of N. gonorrhoeae-specific antibodies with the assay’s target antigen or additional components of the assay. If N.

gonorrhoeae infection elicits a general immune response with elevated levels of acute-phase reactants, these reactants may interact with the components of the Biokit test. The Biokit assay manufacturer’s protocol mentions that possible cross-reactions could occur; however, it does not specifically include N. gonorrhoeae, which was highly prevalent in this population. We were not able to control for HSV-1 infection status in the regression model, which may also affect the clarity of the Biokit assay result. 2009; Lingappa et al. The combined sensitivity and specificity was higher if the samples with indeterminate results were tested by a subsequent assay rather than if samples with indeterminate results were considered negative. Therefore, we recommend that the Biokit assay not be used without confirmatory testing of samples with indeterminate results by an alternate assay or repeated testing.

Each of the three assays has particular strengths and weaknesses. For instance, the Biokit test is extremely easy to use and a result can be obtained within minutes; however, the final result can be ambiguous. The Kalon and Focus assays show higher sensitivities and specificities but take several hours to run. They also require equipment beyond that which is provided in the kits, such as a plate reader, a plate washer, reliable electricity, and clean water, to name a few. To enhance the sensitivity and the specificity of testing for HSV-2 in a primarily African-American male population, we looked at 15 serial and parallel algorithms that use combinations of the Kalon, Focus, and Biokit assays. We found that the Kalon assay alone outperforms all of the possible algorithms. It is important to note, however, that the Kalon assay is currently not cleared for clinical use by the Food and Drug Administration.

We would like to reiterate that the results discussed above pertain primarily to a male high-prevalence population and may not extend to female or general populations. Another limitation to interpreting the results is that not all samples were tested for HSV-1 and/or HSV-2 by Western blotting. This could influence the calculated sensitivities and specificities, even though appropriate mathematical adjustments were made. Finally, previous studies have shown that the times from primary infection to detectable seroconversion differ between assays for HSV-2 and that these differences can affect the comparative performance of any of these assays (2).

You may also like

American Society for MicrobiologyClinical and Vaccine Immunology

American Society for MicrobiologyClinical and Vaccine Immunology

American Society for MicrobiologyClinical and Vaccine Immunology
Looking for Herpes Simplex-1 IgM ELISA, 96 wells from DRG International Inc? However, both false-positive and false-negative results can occur with the routinely used indirect measles immunoglobulin M (IgM) serology tests. Unlike IgM antibodies, IgG antibodies can be accurately. The DRG Herpes Simplex Virus Type 2 IgM ELISA Kit is a solid phase enzyme-linked immunosorbent assay (ELISA) Patient samples are diluted with Sample Diluent and additionally incubated with IgG-RF-Sorbent, containing hyper-immune anti-human IgG-class antibody to eliminate competitive inhibition from specific IgG and to remove rheumatoid factors. After a one hour incubation at room temperature, the plate is rinsed with diluted wash solution, in order to remove unbound material. It is useful for determination of IgM-class antibodies to Herpes Simplex Virus Type 1 + 2 in human serum. Previously we reported that 5% of the positive Epstein-Barr virus (EBV) immunoglobulin M (IgM) results obtained on the Liaison platform are falsely elevated, but, while we could demonstrate the interference mechanism, we could not identify a concrete underlying (infectious) cause (2).

Patient samples are diluted with Sample Diluent and additionally incubated with IgG-RF-Sorbent, containing hyperimmune anti-human IgG-class antibody to eliminate competitive inhibition from specific IgG and to remove rheumatoid factors. The best seropositivity rates (in the range of 92 to 100%) were observed with samples collected 6 to 14 days after the onset of symptoms.

You may also like