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 Kirk's Current Veterinary Therapy XI - 205 

                                          "Annual Vaccinations"

                   "A practice that was started many years ago and that lacks
scientific validity or verification is annual revaccination.  Almost
without exception there is no immunologic requirement for
annual revaccination.  Immunity to viruses persists for years or
for the life of the animal.  Successful vaccination to most
bacterial pathogens produces an immunological 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,,,[ets.]), 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).  

Text Book Used By Veterinary Schools Across the Country, 1993 edition

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