Research Article

Age-Dependent Estimates of the Epidemiological Impact of Pandemic Influenza (H1N1-2009) in Japan

Figure 1

Distribution of the antibody titer of hemagglutination inhibition (HI) assay in 2009 and 2010. ((a), (c), and (e)) 2009 and ((b), (d), and (f)) 2010. ((a) and (b)) 0–19 years old. ((c) and (d)) 20–64 years old. ((e) and (f)) 65 years old and older. In both years, the survey took place from July to September.
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(a)
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(b)
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(c)
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(d)
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(e)
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(f)