human metapneumovirus infections--biannual epidemics and clinical findings in children in the region of basel, switzerland.human metapneumovirus (hmpv) epidemics vary in time and severity. we report findings for pcr for hmpv and respiratory syncytial virus (rsv) performed on nasopharyngeal aspirates (npa) of hospitalized and outpatient children with respiratory tract infections between october 2004 and april 2008. a total of 3,934 npas were tested for hmpv and 3,859 for rsv. of these, 198 (5%) were hmpv positive and 869 (23%) were rsv-positive. median age was 17 months and 9 months for hmpv and rsv, respectively. fi ...200919238433
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