The H5N1 bird flu virus mutated somewhat among Indonesians in the largest known human cluster, but did not evolve into a more transmissible form, the World Health Organization(WHO) said on Friday.
A spokeswoman for the U.N. agency, Maria Cheng, said the result came from its investigation into a cluster of cases in northern Sumatra, where the virus killed seven members of a single family in May.
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