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Scatterplots of state hospitalization RRs (season/baseline) versus state PCV coverage for the 1999–2000 through the 2003–2004 seasons for (A) attributed influenza-related pneumonia among those <2 years old and (B) attributed influenza-related pneumonia among those ≥65 years old. The lines represent exponential fits to the data from each season, showing the trend. An asterisk next to the year in each panel indicates a significant trend.
