On a more reassuring note , investigators have found no evidence that the virus has passed directly from person to person . A new bird flu variation has caused 11 deaths in China . The virus is a strain of H5N1 that was first discovered in chickens and pigs last year but it can also be found in birds or other animals such as dogs, cats and ferrets. Experts are concerned by some of the virus mutations found .
A new bird flu variation has caused 11 deaths in China . The virus is a strain of H5N1 that was first discovered in chickens and pigs last year but it can also be found in birds or other animals such as dogs, cats and ferrets. Experts are concerned by some of the virus mutations found .