Each year, an average of 20,000 children under five years of age are hospitalized because of influenza complications (CDC, 2013b). Rates of influenza-associated hospitalization are substantially higher among in- fants and young children than older children, and are similar to rates of other groups, such as the elderly (Fiore et al., 2009). In the outpatient setting,
Each year, an average of 20,000 children under five years of age are hospitalized because of influenza complications (CDC, 2013b). Rates of influenza-associated hospitalization are substantially higher among in- fants and young children than older children, and are similar to rates of other groups, such as the elderly (Fiore et al., 2009). In the outpatient setting,
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