I have 5 chicks that I hatched in an incubator 19 days ago so they are almost 3 weeks old. Two of them have suddenly become partially paralyzed in their legs which was discovered last night. They can't seem to walk and if they do, it's usually backwards although I've seen them stumble forward occasionally. Most of their poop looks normal but this morning I saw that one of them had left a small poop that looked mostly bloody, more than just intestinal lining being shed, I'm sure of it. I've isolated them together with their own food and water. The water has Avia charge 2000 and this morning I added amprolium to it after I saw the bloody poop. One chick willingly eats and drinks with enthusiasm and the other doesn't seem interested at all. The chicks, when they were healthy, were being housed near adults so cross contamination through dust in air is a definite possibility. I've had a similar case happen with a hatchery chick that was about two months old. She became suddenly paralyzed but would still eat and drink and after about a month she got better. I don't remember her having bloody poop though, I'm pretty sure it was normal. The bloody poop makes me think coccidiosis but I don't believe that causes sudden paralysis. The paralysis makes me think mereks, but I've never heard of mereks causing bloody poop. There are no other symptoms presently. Normal weight, no labored breathing, no discharges etc. Any ideas?