i left a post yesterday.... about her i gave the flock duramycin10 the for 3 days for measures so they wouldn't get sick because i just brought birds home into the flock... and i bought all my birds from the same place... they've been off the duramycin for a couple of days now.. but since taking them off of it.. i've noticed that one of my hens.. has been sick.... i think its respiratory.... should i putem back on the duramycin 10 for a couple of days ??? or what???