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Infectious Disease
West Nile virus leads domestic arboviral diseases in 2018 US surveillance report
What's the biggest mosquito-borne disease threat in the U.S.?
A 2018 US surveillance report found West Nile virus was the leading cause of domestically acquired arboviral disease in the continental Unit…
West Nile virus remains the top mosquito-borne disease threat in the U.S., with nearly all cases occurring between April and September.
CDC
Apr 6, 2026
Infectious Disease
West Nile Virus Outbreak Reported in Arizona
West Nile virus outbreak hits Arizona. What does this mean for people?
An observational report describes a West Nile virus outbreak in Arizona. Key details regarding population, interventions, and clinical outco…
West Nile virus is circulating in Arizona, causing flu-like symptoms for most but serious brain inflammation for vulnerable people, so take …
CDC
Apr 6, 2026
Infectious Disease
West Nile Virus outbreak reported in Maricopa County, Arizona in 2021
West Nile Virus outbreak hit Maricopa County in 2021. What happened?
An outbreak report describes a West Nile Virus outbreak in Maricopa County, Arizona in 2021. No specific epidemiological findings, case coun…
A West Nile Virus outbreak struck Maricopa County, Arizona, in 2021, as confirmed by a new health report, though details on cases and impact…
CDC
Apr 5, 2026
Infectious Disease
West Nile virus rates increased in 2021 compared to previous decade median in US surveillance
West Nile virus rates increased in the United States during 2021
A US surveillance report of nationally notifiable arboviral diseases found increased rates of West Nile virus in 2021 compared to the median…
West Nile virus cases in the United States were higher in 2021 than the typical rate seen over the previous ten years.
CDC
Apr 5, 2026
Infectious Disease
CDC surveillance report describes arboviral disease cases in the U.S. during 2022
U.S. health officials describe cases of mosquito and tick-borne diseases in 2022
A CDC surveillance report describes cases of arboviral disease in the United States during 2022. No specific intervention, comparator, or qu…
A routine U.S. health report documents cases of mosquito and tick-borne diseases like West Nile virus and dengue that occurred in 2022.
CDC
Apr 4, 2026
Infectious Disease
Surveillance report details arboviral disease cases in the United States for 2023
What did health officials learn about mosquito and tick disease cases last year?
A surveillance report describes arboviral disease cases reported in the United States during 2023. No specific case counts, outcomes, or com…
A new report maps where mosquito and tick diseases like West Nile virus and Lyme disease appeared across the United States in 2023.
CDC
Apr 4, 2026
Neurology
Surveillance reports decreased incidence of West Nile virus neuroinvasive disease in the United States in 2019
West Nile virus neuroinvasive disease incidence decreased in the United States during 2019
A national surveillance report for 2019 indicates a decrease in the incidence of West Nile virus neuroinvasive disease in the United States.…
Cases of severe West Nile virus affecting the brain dropped in the United States during 2019 compared to previous years.
CDC
Apr 3, 2026