North Dakota reports on West Nile virus activity

BISMARCK, ND (Aug. 15, 2025) - North Dakota Health and Human Services (HHS) has seen a rise in reported West Nile virus cases in recent weeks. State health officials are reminding people to continue taking precautions against mosquito bites that can cause West Nile virus infection.

As of Aug. 14, North Dakota reported 26 human West Nile virus cases, with additional cases pending further results. Of the 26 cases, 11 were hospitalized and nine had nervous system complications. In addition to human cases, 38 mosquito pools and three birds have also tested positive for West Nile virus.

“People should be aware of the increase in mosquitoes spreading West Nile virus and take proper precautions to protect themselves from bites,” said Amanda Bakken, HHS epidemiologist. “Peak West Nile virus activity historically has occurred in late August, but with earlier human cases and high mosquito populations, this is the time to be vigilant and safeguard against disease.”

HHS recommends North Dakotans take these precautions to avoid mosquito bites:

Use insect repellent registered with the U.S. Environmental Protection Agency (EPA) that contain ingredients such as DEET, picaridin, IR3535, oil of lemon eucalyptus, PMD, 2-undecanone, and permethrin (clothing only). Always follow the directions on the manufacturer’s label for safe and effective use.
Wear protective clothing outdoors such as long-sleeved shirts, long pants and socks.
Limit outdoor activities between dusk and dawn when mosquitoes that can carry West Nile virus are most likely to bite.
Eliminate stagnant water in containers around homes where mosquitoes can lay their eggs (e.g. gutters, buckets, flowerpots, old tires, wading pools and birdbaths).
Install or repair screens on windows and doors to keep mosquitoes out of residences.
Maintain a well-trimmed yard and landscape around homes.

Most people infected with West Nile virus experience no symptoms. Those who develop symptoms will commonly report fever, headache, body/joint aches or rash. People who develop severe illness may experience stiff neck, altered mental status, paralysis, coma and possibly death. People over 60, or those who have underlying health issues are at greater risk for developing West Nile neuroinvasive disease.

For more information on West Nile virus, visit: About West Nile Virus

For locations go to the interactive map here: West Nile Cases in ND

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