my flock is allways healthy but i went to a swap in milton ky. on labor day and alltho the chicken i picked up there is fine, mine are getting sick fast. off their feed, swollen eyes bubbles in some eyes others are stuck shut. found 2 pretty bad off 6 days ago and i moved them and started on antibiotic eye med and the yellow water antibiotic. its not made any differance and now i have 4 more showing symptoms, sneezing a little. can anyone advise?