When I was telling my housekeeper that one of my chickens was sick, she talked about how she had chickens when she was little and someone would come yearly to give them eyedrops that prevented what sounded like newcastle. I was like WHAT?!? How have i not heard of this!!!! So I look it up and I see all of this stuff i've never seen before, is there anyone here that knows more about it? Does it really prevent newcastle?