I have 3 hens. One has swollen eye,the red skin around eye. I think it is coryza. Treateing with sulmet in water. Given two doses. Yesterday and today. My concern is that they insist on staying in the coop. I put them in the yard yesterday . They scratched around but kept close to entrance to coop. Definitely not their usual level of activity? They have been in coop all week .Does anyone have any thoughts as to what might be going on?