Mapping the risks of H7N9 infection in China
Avian influenza A (H7N9) is a tricky version of bird flu which seems to be sweeping across China. At the end of April the WHO registered 126 cases and 24 deaths but as of the beginning of May according to the Chinese CDC, there have been 127 confirmed cases of H7N9 in mainland China with 26 deaths.
A lack of information about the virus and its mode of transmission has led to public concerns that H7N9 could be a pandemic waiting to happen. It is a difficult virus to track because its main hosts – birds – do not appear to show symptoms of infection.
But do humans need to be worried? The BBC hesitates with ‘yes and …

