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4.
Figure 1

Figure 1. National trends in influenza–like illness (ILI) (solid line)a and coverage with A(H1N1)pdm09 vaccine (dashed line)b in the United States, and the period of sera collection.. From: Prevalence of Seropositivity to Pandemic Influenza A/H1N1 Virus in the United States following the 2009 Pandemic.

a Source: U.S. Outpatient Influenza-like Illness Surveillance Network (ILINet). b Source: CDC estimates from combined Behavioral Risk Factors Surveillance System (BRFSS) and National 2009 H1N1 Flu Survey (NHFS) data.

Carrie Reed, et al. PLoS One. 2012;7(10):e48187.

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