Relationship between estimated seasonality parameters for model fit to laboratory report data and select climatic factors.

<p>The estimated amplitude of seasonal forcing in RSV transmission (top) and the estimated seasonal offset parameter (bottom: <i>φ</i> = 0 represents January 1 and <i>φ</i> = −0.2 represents October 19) is plotted against (<i>A</i>) annual mean vapor pressure (hecta-Pascals), (<i>B</i>) annual mean minimum temperature (°C), (<i>C</i>) annual mean precipitation (mm/month), and (<i>D</i>) amplitude (relative to the annual mean) and timing of trough in potential evapotranspiration (PET; 0 = January 1, 0.1 = February 6). The colorbar on the right indicates the ratio of the biennial to annual Fourier amplitude for the observed data (outer circle) and fitted model (inner diamond). Select states are labeled: Arizona (AZ), Florida (FL), Georgia (GA), Hawaii (HI), Louisiana (LA), Montana (MT), New York (NY), South Dakota (SD), Texas (TX), Wyoming (WY).