Greenmimama,,, please have them vaccinated ,,,,,(just trying to catch up) we had chickens for 3yrs before ever having sick chicks,,,,,,,, the first 2 batches of chickens were hatchery chickens I got cocci and meriks .....last year I got chicks from a breeder, lost 4 or 6, this yr I bought chicks at CS..... I have one in sick bay right now, thought she had a broken leg.... started reading up on meriks..... this AM I went down to check her and she has 1leg out front 1 out back and can hardly move,,,,, I am as sure as I can be that it is meriks.... with out spending $80 or more on a necropsy, So we are on lock down. no birds in and no birds out. I am in the process of getting vaccine. it is best given to day old chicks but there is success with giving it to older birds. I have found a homeopathic recipe that is supposed to work, thanks to someone on the emergency thread. don't know if it will help but I hope so.