Vaccinations in Veterinary Medicine: Dogs and Cats
by Don Hamilton, DVM
A practice that was started many years ago and that lacks scientific validity or verification is annual re-vaccinations. Almost without exception there is no immunologic requirement for annual revaccinations. Immunity to viruses persists for years or for the life of the animal. Successful vaccination to most bacterial pathogens produces an immunologic memory that remains for years, allowing an animal to develop a protective anamnestic (secondary) response when exposed to virulent organisms. Only the immune response to toxins requires boosters (e.g. tetanus toxin booster, in humans, is recommended once every 7-10 years). And no toxin vaccines are currently used for dogs and cats. Furthermore, revaccination with most viral vaccines fails to stimulate an anamnestic (secondary) response as a result of interference by existing antibody (similar to maternal antibody interference). The practice of annual vaccination in our opinion should be considered of questionable efficacy unless it is used as a mechanism to provide an annual physical examination or is required by law (i.e., certain states require annual revaccination for rabies).
Summary: Yearly "boosters" are unnecessary, provide no benefit if given (will not increase immunity). Thus boosters are either a legal issue (Rabies) or a manipulation issue (inducing clients to come in for examination rather than directly suggesting an examination).
Personally, I could go on & on w/the subject of vaccines...it is a personal decision.
For more info: http://www.shirleys-wellness-cafe.com/petvacc2.htm