I'm pretty sure that they all have a standard "explanation" that they are to give as a matter of policy when they do have issues so as not to lose customers. I'm not really sure I'd trust them to tell me the whole truth. The reason, I've been in other business long enough and been one to be given scripts to use when someone concerned for one reason or another calls as well as any press. I'd still approach the situation with chicks with extreme caution, knowing that even if they BELIEVE that they are telling the truth, it may really just be that their higher ups are doing damage control. That is just the nature of the business.You'll not find such information. Hatcheries don't even want their customers to know that such diseases exist. But, if you ask a specific hatchery, they may be obligated to tell you. Not sure on that one.