Hi there , I had to deal with the most horible infection of one of my hens, I had noticed she was a bit low, so I was checking her vent out for posible signs of trapped egg, when I see a writhing mass of maggots, I thought at first they were coming from the vent, however it was below the vent, some sort of cut that had got dirty, about 2cm long and 1cm wide, I must have removed 30 - 40 maggots, gave her a hot bath,cleaned the infected area, and applied some anticeptic cream, repeated the following day, she seems to be on the mend. Has any one else encountered this? I've heard of cattle getting fly blown but not chickens.