Is Your Veterinarian Being Honest with You? ABC News 11/22/13 http://abcnews.go.com/2020/video/veterinarian-honest-20987714 (Please copy & paste link into your browser if it doesn't work by clicking on it.)
"Pushing the Shots" at 4:31. Remember as you watch that the American Animal Hospital Association Canine Vaccine Guidelines referenced in this news article show distemper, parvo & hepatitis vaccines have a proven MINIMUM duration of immunity of 7 years by challenge and up to 15 years serologically.
The 2003 American Animal Hospital Association Canine Vaccine Guidelines http://www.leerburg.com/special_report.htm state on Page 18 that: ?We now know that booster injections are of no value in dogs already immune, and immunity from distemper infection and vaccination lasts for a minimum of 7 years based on challenge studies and up to 15 years (a lifetime) based on antibody titer.? They further state that hepatitis and parvovirus vaccines have been proven to protect for a minimum of 7 years by challenge and up to 9 and 10 years based on antibody count.
Canine parvo type 2, distemper, adeno type 1 and parainfluenza: "These results suggest that the duration of serological response induced by modified-live vaccines against CPV-2, CDV, CAV-1 and CPiV…vaccines, is beyond 18 months and may extend up to 9 years. Accordingly, these vaccines may be considered for use in extended revaccination interval protocols as recommended by current canine vaccine guidelines." http://www.ncbi.nlm.nih.gov/pubmed/23186088