Vaccinations are a critical part of good equine management and are essential in protecting horses from infectious and contagious diseases. But on occasion, some horses demonstrate mild to moderate reactions to specific antigens (foreign proteins) or adjuvants (substance added to vaccines to enhance the immune response) within the vaccine. The majority of vaccines are administered in a 2 shot series (initial vaccine and a booster) and then every 6-12 months thereafter. Other systemic adverse reactions have been anecdotally reported. When the horse’s body is introduced to a small amount of dead or weakened antigen, it trains the horse’s body to produce antibodies. If these microorganisms are in enough numbers or are powerful enough, they can cause disease. The American Veterinary Medical Association has defined a Core Vaccine as one that protects from a disease that is endemic to a region, those with potential public health significance, those required by law, those that protect from highly virulent/highly infectious diseases, and/or those that protect against diseases that pose a risk of serious illness.
To date, nine EHVs have been identified, worldwide. Horses and humans are considered to be dead-end hosts of the West Nile virus and, therefore, do not contribute to the transmission cycle. WNV is a viral disease which infects the brain and spinal cord. 4. It passes from the saliva of the infected animal into the open wound, attacking neural tissue. Protection against some diseases such as tetanus and rabies can be accomplished by boostering once a year. Your horse is counting on you.