H5N1 avian flu isolate from dairy worker is transmissible, lethal in animals University of Minnesota Twin CitiesH5N1 virus isolated from infected dairy worker is 100% lethal in ferrets, but does not appear to be circulating in nature anymore University of Wisconsin-MadisonBovine H5N1 influenza from infected worker transmissible and lethal in animal models National Institutes of Health (NIH) (.gov)Alarming development as mutated bird flu strain that is 30x deadlier leaves American infected Daily MailExperts warn of mutated bird flu strain that could be 30x deadlier MSN