i have found somthing that kills the virus. coldsore cream. yep thats it. i have used it on my flock and within two days the swellings became smaller and on the 5th day the scabs came off to show clean healthy skin. i am so happy! this definatly works ive done it to 17 chickens all diferant ages and sizes! this is the cure to the long healing proses. give it a try beffore you think of culling.