Dr. Karen Becker's article & interview with Dr. W. Jean Dodds on veterinary antibody titers: http://healthypets.mercola.com/sites...ign=20131104Z1

"Dr. Dodds explained that certain diseases produce what we call 'sterile immunity.' Those diseases include distemper, parvo, and hepatitis in dogs, and panleukopenia in cats. When an animal is exposed to these diseases and recovers, or is vaccinated properly against them, the animal becomes immunized. ....
When an animal is properly vaccinated and becomes immunized, he receives sterile immunity, which is long lasting -- a minimum of seven to nine years, to a maximum of lifetime immunity -- as measured by titer tests. This means the pet cannot become infected, nor will he shed the virus should he be exposed."

"There are antibody titer levels, and there are things called immune memory cells, which remain for a lifetime. Even with low titer values following vaccination, pets may still be protected for up to a year or even longer by immune memory cells...Dr. Dodds explains that she’s not overly worried about a low distemper titer unless the pet is around wildlife. She does worry about parvo. If a parvo titer comes back negative on an ELISA and positive on an IFA, again, the results go to the animal’s vet so he or she can make the judgment call. But Dr. Dodds does discourage vets from delivering combination vaccines and recommends instead a single parvovirus vaccine booster. Single-agent vaccines are significantly less stressful to the body immunologically."

Dr. W. Jean Dodds videotaped interview on veterinary titers http://www.youtube.com/watch?v=jQrh34kHB7s .

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Kris L. Christine
Founder, Co-Trustee
THE RABIES CHALLENGE FUND
www.RabiesChallengeFund.org