Hey all, our 8 week old Ameraucana seems to be suddenly having trouble standing for long periods of time, and he/she has started sitting on its haunches a lot. (it has always done this occasionally, but today it's particularly bad.) He/she still eats and drinks and even walks some, but can't seem to stand for very long without sitting again. I've been reading up on Marek's disease and I'm a bit scared, as the chick has been around our older pullets who are 16 weeks old. None of them are showing symptoms but I am almost wondering if I should buy some vaccine and give it to them just to be safe. What do y'all think might be wrong with our chick?