3-Year Vaccines

My vet has gone 3 years andis fighting to get our city to go 3 years wih rabies instead of every year.  Healso told me Honey, 7 1/2 will not need distemper vax again.  And no that she developed a mast cell tumor, I may not get any vax at all for her except rabies

 Fort Dodge is NOT a nice name to me, after their ProHeart6 killed my 4 year old olden retriever, Hunter, almost 6 years ago.  My vet refers to them as "the company you don't like", never by name.

Pfizer's Defensor 3 rabies vaccine contains gentamicin as the preservative.
http://www.atozvetsupply.com/Defensor-3-p/165-pfz499.htm

Ft. Dodge's Rabvac 1 rabies vaccine also contains gentamicin as the preservative.
http://www.atozvetsupply.com/Rabvac-1-p/684-fdrv1.htm

I haven't been able to find the preservative(s) used in Ft. Dodge's Rabvac 3 rabies vaccine which I find very suspicious.  Gentamicin, thimerosal, and amphotericin B are among the preservatives used by Ft. Dodge.  All three are used in Ft. Dodge's absolutely useless canine coronavirus vaccine.
http://www.agri-med.com/site/255063/product/DURMN_CVK_10

Anyone have a Rabvac 3 package insert? 

Ok that's ... strange ... using an antibiotic as a preservative?  Gentamicin?

calliecritturs

Ok that's ... strange ... using an antibiotic as a preservative?  Gentamicin?

Yeh, I agree!  It does sound strange.  However, "Gentamicin is a bactericidal antibiotic that works by binding the 30S subunit of the bacterial ribosome, interrupting protein synthesis."
http://en.wikipedia.org/wiki/Gentamicin

Most canine vaccines are for viruses - distemper, parvo, parainfluenza, adrenovirus, rabies, etc. - so a bacterial antibiotic wouldn't harm them.  It would, however, reduce or eliminate bacterial growth in the vaccine.