There is a good bit of incorrect and/or old information in these threads about vaccinations and titering.
A very good website (run by a Texas veterinarian with references to many published papers by Dr. Jean Dodds and Dr. Ron Schultz) all about vaccinations:
I've used this site for years and it is always up-to-date - it includes an extensive bibliography of veterinary published papers by Dr. Jean Dodds and Dr. Ron Schultz, etc. There is a lot of info on this site and it takes a bit of time to go through it all. Some info that I've cut and pasted:
"Booster vaccines" or annual re-administration of modified live virus vaccines like
distemper and parvo virus do not provide added protection. In previously
vaccinated adult animals the antibodies from previous vaccinations block the
new vaccine. Antibody levels are not increased, memory cells are not increased.
(23 a) (Note from Pat - read about antibodies versus memory cells.)
The duration of immunity for modified live virus vaccines like K9 Distemper and Parvovirus
have been proven to be 7 years by challenge and 15 and 7 years respectively by serology. Memory cells persist for life.(23a,23b) (Dr. Schultz did most of these studies.)
Titers of antibody levels do not accurately predict immunity or lack of immunity. (NOTE FOR EVERYONE WHO IS RUNNING TITERS.)
There is no scientific data to support manufacturers label directions to
re-administer MLV vaccines annually.
See the chart for the new vaccination protocol and notice that you MUST booster at one year (after giving the puppy vaccs) - one person mentioned only giving parvo and distemper vacc at a few months and not boostering a year later. That does NOT give adequate immunity. Note again that latest conclusion is now that titers do NOT reflect immunity or lack of immunity.
And another chart:
My advice is to read this information for yourself and make your own decisions about vaccs after discussing the material with your vet versus reading a thread and following someone's posted advice which may or may not be accurate. Print these out and share with your vet as there are many cited vet studies.