The infection rate was affected by the treatment (glm: df = 3,132, Deviance 30.66, Residual deviance = 115.34, χ2 = 33.355, P < 0.0001): the proportion of infected females at the C1 concentration (intercept = 0.272, SE = 0.332, z = 0.819, P = 0.4125) was significantly greater than the proportion at the C2–C4 concentration (C2: coefficient = -2.351, SE = 0.626, z = -3.759, P = 0.0002; C3: coefficient = -2.575, SE = 0.690, z = -3.729, P = 0.0002; C4: coefficient = -2.469, SE = 0.6931, z = -3.562, P = 0.0004). The gene discussed is C3; the disease is infection.