sneezing chickens now three instead of one

[crazyhen]

Today I feed the hens yogurt and put antibiotics in their water. What is going on. The house was aired good for a couple of weeks then I purchased the hens at auction. On the way home I noticed one sneezed but it had been dusty there so I didn't think much about it until Sun. When two started it and now 3. Help Jean

 

[kinnip]

There's a sticky at the top of the "Emergencies..." page. It has some questions that will help everyone pinpoint the problem.