Alot of time vaccines can actually cause their own problems or get you or your cat sick. Jenny McCarthy has well publicized the minority knowledge that there is a possible linkage from the combination of vaccines given to human babies causing ever growing later incidents of autism as children age.
IMHO I would not trust the medical profession too deeply. They do not question certain axioms. The intellectual Ivan Illich in his work Medical Nemesis
says that the main purpose of the medical profession is to adjust us to modern capitalist growth and development. The high prevalence of diabetes in Western society is a consequence of Western diet high in bread, sugars, etc. according to Michael Pollan (talk of Michael Pollan on our modern industrial diet and the health issues it causes
Basically the entire medical profession has an instrumentalist, mechanistic approach to problems instead of trying to examine deeper issues. Give this prescription, give that treatment, remove this tooth. Instead of asking what in diet in this uniquely invented industrial food stuff industries and our man-made environment is causing the underlying and deeper issues making sickness so prevalent.