Killer H5N1 bird flu strain 'mutated slightly'

A World Health Organisation (WHO) investigation showed that the H5N1 virus mutated slightly in an Indonesian family cluster on Sumatra island.

The virus that infected eight members of a family last month – killing seven of them – appears to have slightly mutated in a 10-year-old boy, who is then suspected of passing the virus to his father, the WHO investigative report said.