we ordered 31 chicks from McMurray hatchery. On arrival, 1 was dead, one barely alive, and 2 partly paralyzed or injured. after that,3 hours later, two more appeared to become very weak, same results. all the others very healthy, eating, drinking, running around as normal. today, 4 more appear to become very weak, within hours 2 more have died, 2 more are barely there. all the others happy, healthy, and running around at this point. So far 8 died and more on the way. What is going on? i've always had succesful luck. Is this Mareks? they were vaccinated for mareks. Apreciate your help!!!!!!!!!