[Rowdee]

One thing we found out when we were raising livestock was that there is always a % of a group of animals on which a vaccine will not take--for whatever reason.

And at the same, we've been warned about adverse reactions.

[Harrison Bergeron]

"One thing we found out when we were raising livestock was that there is always a % of a group of animals on which a vaccine will not take--for whatever reason."

And, conversely, veterinarian schools are now looking seriously at overvaccination of pets as a source of rampant increases in diabetes, cancers, arthritis, and other potentially auto-immune related diseases. This doesn't have relevancy to humans at this point. The studies, which my veteranarian printed out for me, have to do with repeated annual vaccinations for rabies, distemper, parvo, etc. diseases which may be unnecessary - possibly harmful - at such frequent intervals. Many jurisdictions now allow blood titers to be taken for vaccine levels and will waive vaccinations if the titer result is certified as adequate to prevent disease by the vet. The titers are about as costly, sometimes less so, than the vacinations, so I go this route with my pets.