Breeding Site Characteristics and Associated Factors of Complex in Lhasa, Tibet, P. R. China.

Characterizing the breeding sites of complex is of major importance for the control of West Nile disease and other related diseases. However, little information is available about the characteristics and associated factors of the breeding sites of the complex in Lhasa, a representative high-altitude region in Southwestern China. In this study, a cross-sectional study concerning the breeding site characteristics and associated factors of the complex was carried out in Lhasa, Tibet from 2013-2016. Chi-square analysis and binary logistic regression analysis were applied to identify the key factors associated with the presence of complex larvae. Using a standard dipping method, 184 water bodies were examined and complex larvae were observed in 36 (19.57%) of them. There were significant differences in the composition of complex larvae among the breeding site stability (χ = 19.08, = 0.00) and presence or absence of predators (χ = 6.986, = 0.008). Binary logistic regression analysis indicated that breeding site stability and presence or absence of predators were significantly associated with the presence of complex larvae in Chengguan District, Lhasa. Relatively permanent water bodies such as water bodies along river fringes, ponds and puddles, and water bodies with no predators should be paid more attention for future complex larvae abatement campaigns in Lhasa, China.