I have a new hen & her mate in quarantine still. A few days after arrival she began having a runny nose. Now she is coughing and raspy. I went to my local farm supply and the only antibiotic they had for poultry is Oxytetracycline powder. I am fixing to treat her & the roo with that. Should I treat the rest of my flock with Vet Rx just incase, since it is being coughed into the air? How long will I need to not eat or hatch eggs for either medication??