Clinical Features of the Initial Cases of 2009 Pandemic Influenza A (H1N1) Virus Infection in China

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Abstract
The first case of 2009 pandemic influenza A (H1N1) virus infection in China was documented on May 10. Subsequently, persons with suspected cases of infection and contacts of those with suspected infection were tested. Persons in whom infection was confirmed were hospitalized and quarantined, and some of them were closely observed for the purpose of investigating the nature and duration of the disease.
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