Figure 1

Fig. 1. Weekly epidemic time series. (A) Death rates from pneumonia and influenza (P&I) in the United States (excluding Hawaii and Alaska) and each of the four administrative regions (Northeast, Midwest, South, and West). Deaths are shown per 100,000 population on a log10 scale. (B and C) Death rates in excess attributed to influenza in the United States (B) and by state as a color intensity plot (C). Rates are normalized to have zero mean and unit variance. (C) The 49 "states" are arranged by decreasing population sizes (from top = California to bottom = Wyoming). Vertical bands in red correspond to synchronized epidemics, which occur in the most populated states or during larger epidemics, suggesting that synchrony increases with population size and epidemic size. (See also fig. S1.) [View Larger Version of this Image (222K JPEG file)]

 

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