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West Nile virus cases, vector indices, and public health responses—Maricopa County, Arizona, 2021

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Number of West Nile virus cases (N = 1487), vector indices, and public health responses, by epidemiologic week start date--Maricopa County, Arizona, 2021. Neuroinvasive and non-neuroinvasive cases are shown. The vector index is the estimated proportion of infected mosquitoes of a particular species in a specific area collected during weekly mosquito surveillance. The number of persons with West Nile virus each week is based on date of symptom onset; vector index data are based on date of mosquito collection, which lags from MCDPH notification date by approximately 1 to 2 weeks. Abbreviations: MCDPH = Maricopa County Department of Public Health; MCESD-VCD = Maricopa County Environmental Services Department, Vector Control Division; VI = vector index; WNV = West Nile virus. (Source: Kretschmer M, Ruberto I, Townsend J, et al. Unprecedented outbreak of West Nile virus - Maricopa County, Arizona, 2021. MMWR Morb Mortal Wkly Rep 2023;72[17]:452-7. Public domain.)