Effect of dengue virus serotype-1 infection on female Aedes aegypti survival, for each of three temperature regimens. A, Constant 26°C (χ2 = 3.31, degrees of freedom [df] = 1, P = 0.068). B, small fluctuations (χ2 = 13.93, df = 1, P < 0.001). C, Large fluctuations (χ2 = 6.59, df = 1, P = 0.010).