The following is an excerpt from holistichorsekeeping.com message board, the poster is a vet who sued the good old Texas Vet Medical Board over failure to address what he says are unnecessary yearly vaccines in cats & dogs. (I rechecked the date, original post was in 2005 - I don't know how it was resolved). Most of the information probably applies to horses as well, this is a horse board it's on. He does say elsewhere in the text that since many vaccines for horses are killed vaccines, that they can be given annually vs the modified live usually given to small animals. Lots of interesting topics. I don't treat my horses holistically for the most part as it takes some education and a commitment I haven't made, but I think they bring up a lot of good points. You can read the board for free, but have to pay yearly dues to be a poster.
Adjuvants are something that is added to the vaccine to stimulate the immune system. There is lots of evidence to show that it is adjuvants that is the cause of cancer in cats. I’m not saying that a non-adjuvanted vaccines can’t possible cause cancer, but certainly the adjuvant vaccines are at least five times more likely.
Lisa-What type of substances are used for adjuvants?
Dr Rogers-It’s usually an aluminum added. The way it works is it creates inflammation which draws the immune system to the site of the vaccine. It also makes a vaccination more of a sustained release product. Cats are unique in that inflammation can turn into cancer. There are non-adjuvanted vaccines; they don’t cost anymore and yet they only have about 10% of the market. Only 10% of vets are going to all non-adjuvanted vaccines.
Lisa-Does that go back to them just not knowing?
Dr Rogers-I think it goes back to the vaccine manufacturer disseminating false and misleading information. Certainly the companies that don’t make a non-adjuvant vaccines want to go around and say it hasn’t been proven that adjuvants are the culprit.
Lisa-Doesn’t that come down to demand? If there were more vets and owners demanding the types of vaccines, then the drug companies would either get onboard or they’re going to lose their shirt.
Dr Rogers-Absolutely. Adjuvants were declared a Class 2 Carcinogen by the World Health Organization. If that was recognized by the USDA, they would have to take all the adjuvant vaccines off the market. So again I think the USDA is asleep at the wheel.
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