Brought my 4 chickens home a week ago and one had a "runny nose" administered VetRx under wings, a couple drops down throat and rubbed diluted mix on head. Also put VetRx in drinking water. Runny nose stopped on that one bird and all birds eating, drinking, scratching around, roosting well, generally all looking very healthy. Last night heard "runny nose" bird "snoring" now she seems to be sneezing a bit and the snoring persists although it seems not as bad tonight. I noticed one other bird sneezing a bit today and perhaps "snoring" tonight. No runny noses and again all seem to be in good health and spirits birds caught a snake today. Now I understand that on forums many bad problems are posted often and very few "my chickens were sneezing and now they are fine it just needed to run its course" stories never make it online so a new chicken owner can get freaked out easily. Do I need to stick with VetRx or move to an injectable antibiotic like Tylan 50 ASAP? If not move to antibiotics now and continue VetRx when should I move to Tylan 50 if conditions worsen? Or will these things run their course? Thank you in advance for help and or advice Lou.