I would fight the lady to get a refund. Send one of the birds to be tested, when you get the results present them to the seller. Since you have never had chickens, your "flock" could not have infected them, so common sense tells her where they got it from. If she refuses, then off to small claims court. If those birds were sick when you got them, she knew it. She needs to be held accountable for her actions so she does not do this to others. IMO
