Happ, I've been the the cattle business many years, vaccines work.
Cattle and people aren't the same. Any of your cattle ever get the Guillain-Barre syndrome after you vaccinate them? My SIL's mother got a flu vaccine 5 years followed soon after by the Guillain-Barre syndrome and was paralyzed in bed for 6 months. After a lot physical therapy she is able to get out of bed by herself and move around slowly with a walker. She has to wear a neck brace except when she is lying down because she can't head upright. She still gets a flu shot every year.
Remember when kids were born without arms and legs because their mothers took Thalidomide when they were pregnant? The drug companies assured everybody that it couldn't be caused by Thalidomide because none of the lab rats they tested it on had any legs missing. You could by it over the counter and it took a long time to get it of the market.
