Study on impact of environmental changes on West Nile virus epidemiology and dynamics elsevierconnect MADRID EnvironmentalChange WestNileVirus Epidemiology Dynamics
By Pooja Toshniwal PahariaFeb 1 2023Reviewed by Aimee Molineux In a recent study published in One Health, researchers performed a systematic review to identify environmental factors related to alterations in WNV transmission and vector distribution in the EU and the MR .
The study was conducted between 1 June 2021 and 30 June 2021. Original research articles of studies performed in MR and Europe on the West Nile virus and its vectors, and environmental factors associated with changes in WNV virology and transmission, were included. The studies were published between January 1, 2000, and December 31, 2020, in English, Portuguese, French, Spanish, German, and Italian.
Results A total of 65 records were considered for the final analysis, comprising 62 records obtained from databases and three supplemental records, of medium or good quality. Of the records analyzed, 32% belonged to Italy. Culex mosquitoes were studied in 40% of records, humans were studied in 29% of records, and animal hosts were addressed in 25% of records. In addition, avian hosts were studied in 8.0% of records.
Other factors correlating positively with WNV presence in mosquitoes included daytime durations, evapotranspiration, and hours of insulation, whereas altitude correlated negatively with Cx. modestus and Cx. pipiens abundance. Regarding WNV incidence and/or prevalence in vertebrate hosts , temperature elevations and wetland presence showed positive correlations.
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