Description: Epidemiology and Infection publishes original reports and reviews on all aspects of infection in humans and animals. As the detection of HHV-6 in plasma might be negative while positive in PBMCs , this study was performed for detection of HHV-6A/B in PBMCs of SC and BD patients with a type specific Real time PCR and compared the results with HCs to find the latent infections. Sixty five patients with gastrointestinal cancer before surgery and without any treatment were enrolled in this study and divided into two groups depending on lymphocytes’ count: I group (n = 35) — lymphocytes > 1400×10(6)/L and II group (n = 30) — lymphocytes < 1400x10(6)/L. This article summarizes the associations between cutaneous disease and HHV-6, HHV-7, and HHV-8. HHV-7 DNA was not detected throughout the observation period. It has become the key periodical in which to find the latest reports on recently discovered infections and new technology. Human herpes virus 6 is a member of the family of herpesviridae and the subfamily of betaherpesvirinae and is associated with widespread infections in humans . However, number of CD19(+) had tendency to increase (p = 0.03). Follow-up studies of the amount of viral DNA in saliva samples revealed that the amount of HHV-7 DNA was rather constant for each individual, and that "high producers" and "low producers" could be distinguished. Transferred antibodies against HHV-7 tended to be higher and remain longer after birth than those of HHV-6, and these findings are consistent with the clinical observation that HHV-6 infection occurs earlier than HHV-7 infection.