VACCINATING--16 Weeks+

[Kris L. Christine]

When considering at what age a puppy should begin receiving its core vaccines, consider the information from the American Animal Hospital Association stating that the maternal antibodies in a puppy younger than 16 weeks may interfer with the immune response. Bear in mind that there are risks associated with vaccinating as well as risks associated with not vaccinating. Making an informed decision is important.

On Page 16 of the attached copy of the American Animal Hospital Association's 2003 Canine Vaccine Guidelines, it reports that: "When vaccinating an animal, the age of the animal, the animal's immune status, and interference by maternal antibodies in the development of immunity must be considered. Research has demonstrated that the presence of passively acquired maternal antibodies significantly interferes with the immune response to many canine vaccines, including CPV [parvo], CDV [distemper], CAV-2 [hepatitis] and rabies vaccines."

They further state on Page 17 that: "Multiple vaccinations with MLV vaccines are required at various ages only to ensure that one dose of the vaccine reaches the puppy's immune system without interference from passively acquired antibody. Two or more doses of killed vaccines (except rabies) and vectored vaccines are often required to induce an immune response, and both doses should be given at a time when the passively acquired antibody can no longer interfere. Thus, when puppies are first vaccinated at 16 weeks (or more) of age (an age when passively acquired antibodies generally don't cause interference), one does of an MLV vaccine, or two doses of a killed vaccine, are adequate to stimulate an immune response."

The AAHA Canine Vaccine Guidelines also declare on Page 17 that: "If a pup fails to respond, primarily due to interference by passively acquired maternal antibody, it is necessary to revaccinate at a later time to ensure adequate immunity."

If anyone would like copies of the American Animal Hospital Association's Canine Vaccine Guidelines, the 1992 French challenge study demonstrating that dogs were immune to a rabies challenge 5 years after vaccination, the 2003 Italian study documenting fibrosarcomas at the presumed injection sites of rabies vaccines in dogs, as well as Dr. W. Jean Dodds' papers on vaccinal adverse reactions, please e-mail me at ledgespring@lincoln.midcoast.com.