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Underlying medical conditions in persons who died from influenza A(H1N1)pdm09 (n = 58),Viet Nam, 2009–2010
* Cases may have more than one underlying medical condition; the category labelled “Other risk factors” included arthritis, malaria, Down syndrome, hepatitis B, and sequelae of polio.
** Obesity was defined as a body mass index equal to or more than 30.
