Mar 18, 2025 - News
Mapped: West Nile cases
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West Nile virus infections were down statewide last year, particularly in Maricopa County.
By the numbers: The Centers for Disease Control counted 31 Arizona cases of West Nile virus in humans in 2024.
- Twenty cases were in Maricopa County, with four in Pinal County, three apiece in Gila and Pima counties, and one case in Cochise County.
- Non-human infections were also found in Navajo County.
Catch up quick: That's a significant drop from 2023, when Arizona had 46 confirmed human infections, 41 of them in Maricopa, according to the Arizona Department of Health Services (ADHS).
- ADHS reported another 36 probable cases that year that weren't confirmed.
Between the lines: Mosquito-borne diseases are most common from May to October.
- West Nile virus symptoms include fever, headaches, body aches, joint pain, vomiting, diarrhea and rashes.
- Only about 20% of infected people will have symptoms.