More Cases Of West Nile Virus Reported In Northwest Iowa

Sioux County, Iowa — Sioux County is one of the latest counties to see a case of West Nile Virus this year, according to the Iowa Department of Public Health.

Iowa Department of Public Health IDPHThe Iowa Department of Public Health (IDPH) has announced that seven cases of West Nile virus have been confirmed in Iowa: one case each in Buchanan, Clay, Crawford, Monona, Plymouth, Sioux and Woodbury counties. Additional cases are being investigated in Sac and Shelby counties. Two of the confirmed cases were hospitalized, but are now recovering at home.

In addition to the human cases of West Nile virus, four mosquito pools have tested positive for the virus: two pools in Story County, one from Polk County, and one from Woodbury County. Mosquito pools are a method researchers use to see if insects in an area are carrying the West Nile virus, which can then be transmitted to humans through a bite. A horse in Johnson County tested positive for West Nile virus.

IDPH Medical Director Dr. Patricia Quinlisk says her department is now seeing either confirmed human cases, animal cases, or positive mosquito pools across a large area of the state.  Quinlisk says that’s not unexpected as late summer and autumn are the times when mosquitoes carrying West Nile virus are most likely to be circulating.  She says that’s why it’s important to continue to use insect repellent when outdoors, and to take other protective and preventive measures.”


  • Use insect repellent with DEET, picaridin, IR3535, or oil of lemon eucalyptus. Always read the repellent label and consult with a health care provider if you have questions when using these types of products for children. For example, DEET should not be used on infants less than 2 months old and oil of lemon eucalyptus should not be used on children under 3 years old.
  • Avoid outdoor activities at dusk and dawn when mosquitoes are most active.
  • Wear long-sleeved shirts, pants, shoes, and socks whenever possible outdoors.


  • Eliminate standing water around the home because that’s where mosquitoes lay eggs.
  • Empty water from buckets, cans, pool covers and pet water dishes.
  • Change water in bird baths every three to four days.

Approximately 20 percent of people infected with West Nile virus will have mild to moderate symptoms such as fever, headache, body aches and vomiting, according to Quinlisk. Less than one percent of people infected become seriously ill and rarely someone dies, she says.  Since West Nile first appeared in Iowa in 2002, it has been found in every county in Iowa, either in humans, horses, or birds. In 2013, there were 44 human cases of West Nile virus and zero deaths, according to the IDPH.

To see the latest surveillance report on West Nile virus disease and to learn more about how to prevent it, Click here.

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