Hi. as i wrote there before 2 days, im freaking out, and noone gives a answer. I slaughter all symptoms showing grown up old hens, but today I found out one breed chick 9 weeks old, had to start puffy face shown up. Enough. Im giving everyone antibiotics. Guess tylan is the best one, going to find in my country. Should I give to those on whichs I saw the virus? I guess I should give to every one.