Comparative study on the surveillance of Aedes albopictus by Breteau index and Mosq-ovitrap index in different habitats

Abstract

Objective To compare Mosq-ovitrap index (MOI) and Breteau index (BI) of Aedes albopictus in two types of surveillance area through field experiments, and provide the basis for application and evaluation of two surveillance methods. Methods From April to December of 2020, Keqiao district with local transmission of dengue fever and Xinchang county without dengue fever transmission were selected as two surveillance areas in Shaoxing, Zhejiang Province. The density of Aedes albopictus larvae was monitored by BI and MOI at 10 day interval in a month, respectively. Results A total of 10 718 households were investigated, and 745 positive water containers were found, with a BI of 6.95. The BI in Keqiao district (6.98) was similar to that in Xinchang county (6.92). The peak value of BI was 11.28 in urban residential area in July, while 12.67 in rural residential area in May. A total of 11 837 mosq-ovitraps were placed around the BI investigated households, and the MOI was 1.62, while 189 mosq-ovitraps were found to be positive. The MOI was 2.37 in Keqiao district, higher than that in Xinchang county (MOI: 0.75). The MOI in urban residential area was 1.80, higher than that in rural residential area (MOI: 1.44). Pearson correlation analysis showed that there was a statistical correlation between BI and MOI Shaoxing (r=0.676, P=0.046), also in Xinchang county (r= 0.794, P=0.011) and urban residential areas (r=0.691, P=0.039). Conclusion Mosq-ovitrap and Breteau index were effective indicators in the monitoring of Aedes albopictus, but with different sensitivity in rural and urban residential areas.