I had a case maybe 2 months ago my chickens got sick. I thought it was coryza my neibor has chickens had convinced me that it was just a cold they look healthy. I was a new chicken lover so I took his advice since then no problems except I had one with a runny nose and cough I just culled. Well now I got one with bubbles in her eyes she has been isolated gave her tylan 250 still bubbles after a week. I want to get my chickens tested how do I????