I have three chickens, chicks from MMcM this spring, that have gone lame in one leg. They were in flocks and each just one day started standing on one leg and hopping on the other and then just sat and couldn’t move themselves. The first happened 1 month ago, rooster Ginger broiler, and has been isolated since but has not shown improvement. Happened to a second rooster, Delaware and in neighboring but separate pen, 1 week ago. He hopped around very good on one leg and then just sat down yesterday and can no longer move himself. Yesterday I also noticed a Ginger hen who seems to be lame in a leg now. I don’t know what is going on. Should I be worried about a virus? In the beginning I thought it was just a sprain which seems likely for roosters but now I don’t know. Any ideas appreciated.