I called Mcmurry today they said after 30 days of giving them the vacc have no concerns with getting passed to any chicks or chickens it's more like 10-14 but 30 days is what most people wait to be on the side of caution. It's like getting a flu shot when they use live virus in them your body builds immuity to the flu virus that is in vacc.. true some might get it the flu from live virus, usally if you have a weaker immune systems and the same with chickens that's why she said give it 30 days to shed New castles goes in the water and the lT is eye drop.
I'm glad I found out. My neighbor had no Idea what she did give them.To top it all off they just moved here and there are farms all around me, if what she said WAS true she would have put all our birds at risk my biggest concern was for my other neighbor jack who make a living on selling Veggie, eggs, beef, ect.. and grow Organic, and they had taken some of her roos to a friend for a favor because this neighbor had too many asked her if she wanted some. We both learned a huge lesson always ask question on what you GIVE any animal or who you get them from and what they gave them and don't just give them stuff without looking into it what it does and for how long.
And thanks to all the BYCers that responded to this topic
you are all very knowledgeable people and I've learned alot from you.