I am having the same issues with my Buff Orp's. had 4-2 month olds that started sneezing, weezing and onewith a swollen eye. put all 4 on 10 days of duramycine-10 and petrx (on nostrils) all but one recovered (she was the smallest and worse one) the other 3 have been fine for the past week but last night I have them all sneezing again one with swollen eye, slight rattle in chest and brown diarrhea...not sure what else to do, so putting them back on the duramycin as if today