In recent weeks, scenes of hospitals in China overrun with masked people have made their rounds on social media, sparking worries of another pandemic.
HMPV is a virus that will lead to a mild upper respiratory tract infection - practically indistinguishable from flu - for most people.
If infected, a 'small but significant proportion' among the immunocompromised will develop more severe disease where the lungs are affected, with wheezing, breathlessness and symptoms of croup.
Many will require hospital care, with a smaller proportion at risk of dying from the infection,
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