Help! I just lost one of my 12 week old pullets to symptoms of Mereks disease. After talking to the individual that I bought her, another pullet, and a roo from, she didn't vaccinate for Mereks. The other 10 pullets I have I know were vaccinated, and I'm not sure about my other roo. So far the other two are acting like their normal selves, so I'm a little on edge. How long do I need to be extra watchful, especially for those two? Is there anything I can be doing right now? Thanks for any advice, since I'm a total newbie. All of my pullets are roughly 12 weeks old, and the roos are 12 and 15 weeks, roughly.