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An 11-year-old girl in southern Cambodia who died last week after being infected with avian influenza A (H5N1) had a different strain from the one causing mass deaths in wild and domestic birds globally, says the scientist who led the effort to sequence viral samples from the girl. Scientists were initially concerned that the girl might have been infected with the widely circulating virus that is now spreading in some mammal species and has infected a handful of people since 2020.