“…Bacterial coinfection may have occurred less commonly in the setting of H1N1 disease than with seasonal influenza, but when identified at initial presentation, it was associated with increased risk of mortality (23,26,27). The clinical course of 2009 H1N1 appeared to diverge from that of seasonal influenza in its more frequent association with concurrent shock in children, a circumstance that predicted increased mortality (26), and in its association with rapidly progressive hypoxia and respiratory failure (28,29).…”