Quote: Even the vaccine's makers will tell you it's not 100%, in fact it's often far from it; some vaccines are closer to 10%. That opinion is straight from more than a few agricultural vets. In my experience with chickens the vaccinated ones are sub-par as a matter of course and are always the weakest. I swear by non vaccinating, though I'm not going to ply the emotional angle to get those who swear by vaccinating to do it my way. If you care at all about your birds, you will find what works. That's as far as I'd take that statement, no matter what my opinions are as opposed to other's opinions. Doubtless, I think, there must be a chicken out there whose life was saved by a vaccination, and another whose life was saved by homeopathy, and another whose life was saved by colloidal silver, and another whose life was saved by garlic or other herbs, and another whose life was saved by an orange falling off the tree at the right time, and so forth. Diseases are so variable and so are their victims, it's really not something anyone can guarantee 100% in any direction. Off topic, recently both my family's pets (staffy mix dog and ragdoll mix cat) came to the point of death with a severe wasting disease that attacked the neurological system. Silver cured them when all else failed. I myself use garlic and assorted natural remedies because they've proven their worth to me over and over and over again. When I was younger as well as recently several very different alternative therapies have saved my life from several very different and unrelated normally fatal problems. Medical science has no cure for two of these issues. It pays to keep an open mind because the drug sellers aren't focused on cure as it's time consuming as opposed to merely culling and replacing. Economics... Therefore science in the matter of health is limited by lack of major industry support in many crucial areas.