Hello I'm kinda new to owning hens and rooster we currently got 19 week old roos and pullets and I didnt find out about mareks when I bought fowlpox vaccine and i see that it's a deadly disease that can kill your birds from the inside with tumors in their organs I'm wondering if I should buy it or is it to late we live in an area where no one except my aunt 4 miles away and my cousing like 18 miles away since it's in a populated area there has been no chicken history in any houses and we got 9 pullets and 6 roos my parents are going to kill 4 and leave 2 so it's kind of a small flock they have been staying a while in the garage since mid November to now since the cold should we buy the vaccine or is it to late?