Resumen de Is a flu pandemic only two mutations away?
In China, eight people had died and at least 16 more were seriously ill in the latest outbreak of bird flu, H7N9. But there are fears that the death toll could rise much higher because the virus already has three of the five mutations that people know would allow another bird flu, H5N1, to spread between mammals. Chinese authorities are tracing contacts of known cases to see whether the infection has already spread between humans
