Trends of the dengue epidemics and the relationships among the cases in Taiwan from 2007–2010. (A) A comparison of the fluctuations of the monthly number of imported (Xt) vs. domestic cases (Y). (B) The diversity in the annual dominant dengue serotypes among the domestic and imported cases. (C) The scatter plots show the relationship of the number of imported dengue cases (Xt-0), (Xt-1), (Xt-2) or (Xt-3) vs. the number of domestic dengue cases, as detected by a monthly surveillance (Y). The respective straight lines represent the lines fitted by the means of the least squares regressions. The coefficients of determination, R2, were estimated to be 0.059, 0.21, 0.31, or 0.21 (n = 48) with respective 95% confidence intervals for the slopes being −0.57-6.67, 2.68-9.19, 3.81-9.93, or 2.46-8.98. (C) The diversity in the annual dominant dengue serotypes among the domestic and imported cases.