I have some young guineas about 4 months old. They have been doing fine untill about a week ago. I came home to find one of them sick. his feathers were ruffled up and he just moped around. The next morning he was dead. The next day 2 more were looking the same way-The next day they were dead. What ever is causing it they only last about one to two days. They have been wormed. I've tried sulmet and also tried Tylan 50,but they still keep dying. Does anyone know whats going on or how to cure them. Thanks