A new strain of bird flu (H7N9*) has appeared in China. Since the first report two weeks ago, 51 people are known to have been infected of which 11 have died. Transmission seems to be from close contact with poultry and many birds are being culled as a precaution. Cases started in Shanghai and the eastern provinces of Jiangsu and Zhejiang but have now been reported in Beijing.
*Flu viruses are classified into subtypes based on antibody responses to the two large glycoproteins on the outside of the viral particles, hemagglutinin and neuraminidase.