Objective To investigate the density and seasonal variation of Aedes albopictus larvae in Linyi, Shandong province, China and assess the transmission risk of dengue fever, and to prevent the occurrence and epidemic of dengue fever. Methods The Breteau index (BI) was adopted to monitor Ae. albopictus larvae. SPSS 20.0 software was used for statistical analysis, and Chi-squared test was used for comparison of categorical data. Results The BI values of Ae. albopictus larvae were 18.97, 10.79, and 13.88 from 2018 to 2020, respectively, with a mean value of 14.98. The mean BI was higher in Lanling county than in Hedong district and Yinan county. In the three years, the mean BI of households and waste collection stations was 33.03 and 27.00, respectively, indicating a regional epidemic risk of dengue fever; the mean BI in residential areas was 14.36, indicating an outbreak risk of dengue fever; the mean BI of construction sites and parks were 9.31 and 9.27, respectively, indicating a risk of transmission; the mean BI was 4.33 in hospitals, suggesting no risk of dengue fever. The positive rate of mosquito larvae in total water containers was 21.72%, and the waste tires had the highest positive rate of 40.34%. The BI of Ae. albopictus larvae peaked at 54.63 in August 2018, at 40.00 in August 2019, and at 47.51 in July 2020. There was a high regional epidemic risk of dengue fever from June to August, a transmission risk in May, September, and October, and no risk in March, April, and November. Conclusion There is a high density of Ae. albopictus mosquitoes in Linyi, indicating an outbreak or regional epidemic risk of dengue fever. Aedes surveillance and risk control should be strengthened.
XUE Hai-bin, MENG Jin-xia, REN Le, JING Xiao
. Larval Aedes albopictus mosquito surveillance and risk assessment in Linyi, Shandong province, China, 2018-2020[J]. Chinese Journal of Vector Biology and Control, 2021
, 32(6)
: 686
-690
.
DOI: 10.11853/j.issn.1003.8280.2021.06.006
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