I got a pullet at 9 weeks old about a month ago as part of a trio. So she's about 13 weeks now. My other 13 pullets and cockeral are all vaccinated for mareks, but this trio was never vaccinated. Over the last week, I've noticed her holding her right eye shut. It's not swollen, watery, or irritated, just held shut. She can open it, but doesn't seem to want to. Pupil seems responsive to light. Her activity level has gone WAY down and her head stays held in close to her body. She also appears to be favoring one leg. Not limping, but when she stops moving, I've seen her standing on one leg ( left) with the right foot curled under her on the ground or stretched behind her like she's mid-stride. The rains finally stopped here today and of course we now have sweltering heat, so there is definitely an element of stress. She's eating and drinking and keeping up with her cockeral brother and sister. But they are kind of slowing their pace to allow her to keep up. I've also got another cockeral with a nasty eye (maybe Mycoplasma Gallisepticum Bacteria) and another cockeral (her brother) with a little bit of scabbing on his comb (thinking fowl pox). I'm treating everyone with sulfadimethazine because I've also noticed some dark loose stools so I want to treat all for cocci. Again. Just in case. Could this pullet be suffering from either Fowl pox orMycoplasma Gallisepticum Bacteria, or is it likely mareks? Is there a way to tell the difference in the diseases? Aside from cocci in chicks, my birds were fairly healthy up until the flooding and days of rain and damp humidity and then everything started going down hill. I have been flushing her eye and putting human grade antibiotics (all I've got) and tonight I put some Valbazen and saline mixture (mixed 1:2) to treat for eye worm just in case. Is there anything that I can do?