Epidemiological and clinical characteristics of childhood pandemic 2009 H1N1 virus infection: an observational cohort study

Abstract

Children of all ages affected with even rates of infection, but males were predominant in pneumonia patients. Pneumonia patients showed lymphopenia and its severity was associated with the severity of illness. Our results suggest that the mechanism of lung injury in 2009 H1N1 virus infection may be associated with the host immune response.