Objective To understand the seasonal dynamics of Aedes albopictus larvae and their insecticides resistance distribution in Shanghai and provide science evidence for rational application of insecticides. Methods Density of Ae. albopictus larvae was surveyed by Breteau index(BI) method and Mosquito and oviposition positive index (MOI) method in residential areas, green areas, indoors of public areas and other institutions once a month. Larvae resistance was tested by dipping method recommended by WHO. Results Aedes albopictus had one peak in Shanghai in 2015-2016, and the peak was from June to July. The highest BIs were 6.50 and 6.18 in 2015 and 2016, respectively. The highest MOIs were 10.72 and 6.60 in 2015 and 2016, respectively. The Ae. albopictus larvae showed medium to high resistance to Deltamethrin and beta Cypermethrin, and the highest resistance ratios were 77.00 and 81.00 in Putuo district respectively. Larvae developed low to medium resistance to propoxur, and low resistance to temephos. Conclusion It is necessary to strengthen density and resistance surveillance of Ae. albopictus, and choose insecticides reasonably to delay the development of insecticide resistance and improve control efficacy.
Objective To understand the spatial-temporal distribution of dengue fever epidemics in Shenzhen city, 2014. Methods Geographic information database was established by using the incidence data of dengue fever and demographic data reported. Global indication of spatial autocorrelation, local indication of spatial autocorrelation, and spatial-temporal clustering analysis were conducted with software ArcGIS 10.2 and SaTScan to determine high risk areas of dengue fever. Results The occurrence of local cases had a characteristic of seasonality, mainly occurred in September and October. The spatial aggregation of dengue fever was obvious in Shenzhen city, 2014. The spatial-temporal clustering analysis showed that the most likely clustering was mainly at Southwest districts of Shenzhen city, such as Shekou, Zhaoshang, and Yuehai counties (LLR=44.46, RR=7.30, P<0.001). Conclusion Obvious spatial-temporal clustering of dengue fever distribution was found in Shenzhen city, Attention should be paid to the hot spots in monitoring and early warning to mitigate the transmission.
A new species of biting midge that was collected by light trapping from Dong qian Lake in Ningbo city, Zhejiang province, China, in April, 2016, was named as Forcipomyia (Pedilohelea) zhuguangfengi Ma, Sun et Yu, sp. nov., and was descripted here. The holotype specimen was deposited in the Specimen Collection of Medical Insects (Fengtai 100071,Beijing). The paratype specimens were deposited in the Ningbo City Center for Disease Control and Prevention (Ningbo 315010, Zhejiang).