My pullet, Sugar, has developed a foamy/bubbly eye and her poops stink! She is eating and drinking, is not puffed up and seems to be OK. The eye developed overnight but the stinky poop for the past few days. I hope it is not Coryza, my local feed store said, it's not coryza just an upper respiratory, treat the duramycin, 1 tsp per gallon for 7 days. Do not eat eggs. Your opinion please? The feedstore does not sell sulfamethazone or gallimycin.