My chicks range in age from 2 to 4 weeks and they're a mixed flock of RIR, black australorp, EE, welsummer and NN. About a week ago the welsummer had coughing/sneezing and within 24 hours I noticed a RIR was doing the same. I did some research and figured we would have to cull the whole flock and start over. Sad day. Can't get antibiotics otc and our vet doesn't see chickens. Got some VetRX and put some on their heads and under their wings, chopped up some greens and herbs and put in a pan with some food. Putting GSE in their water and am planning to give some yogurt when done with treatment. I kept everyone together because if one has it they all will anyway. Plus when I separated them then decided to keep them together they were so much happier. You would have thought they'd been separated for weeks with all the chatter. While the rest of the flock does have a similar cough they don't seem as listless as the first two and they all seem to have plenty of energy and lots to talk about. Keeping my fingers crossed.