Found one of my golden buffs 3 yrs old dead this am. she looks fine except for the fact that she is dead. My husband noticed yesterday she had white stuff coming from her mouth. I looked on some other chickens and a couple seem to have scabs on their combs. One in particular that I got from a friends flock that was just added. The comb is off to the side and riddled with scabby marks. WHAT SHOULD I DO????