It is not the speculation that is the problem. It is everyone saying that it is the fault of the hatchery itself. People like to set the blame on others to relieve the thought that they may have contributed the the problem. This could have happened to all hatcheries or just a few. The hatcheries do not keep chicks from each hatch to see if future problems arise. They are not going to know if a vaccine is contaminated or even killed or in the right porprtion to give immunity without causing the true infection. That is up to the companies that make it and they do get missed occasionally. Is it silly to think a company is going to say yes we will pay for hundreds of dollars worth of test when they can refund the money or chicks. These chicks are 2 to 3 dollars a piece. I produced Mareks vaccines for 5 years along with many other types and problems and contamination does happen. If people realized how these vaccines were made they would really have a cow..lol Brain storming is great if it doesnt keep coming back to a slander. Jenn