I have a 18 week old Black Giant pullet, that I noticed limping yesterday, and this morning she will not put any weight on it at all. I've also noticed that she has watery poo, and is off of her feed (she will eat meal worms). I examined her and does not appear to be injured however, her thigh feels warmer than her body. My other pullet (an Opington) is fine. Both were vaccinated by the hatchery for Merek's before delivery. Anyone have any ideas? I've started her on prophylactic antibiotics.