The Iowa Department of Health and Human Services (HHS) has confirmed the state’s first West Nile virus case of 2025, involving a middle-aged adult from northern Iowa. The infection was identified through testing at the State Hygienic Lab. State health officials say warm summer weather and increased outdoor activity raise the risk of mosquito bites, the primary transmission vector for the virus. Mosquitoes across Iowa are already testing positive for West Nile, signaling a persistent statewide risk. Iowa State Medical Director Dr. Robert Kruse says, “We want Iowans to enjoy the outdoors, but also to protect themselves from mosquito bites, which can spread illnesses like West Nile Virus. To stay safe, we recommend using bug spray and make sure your windows in your home have screens.” Health experts also recommend using insect repellent containing DEET, picaridin, or other similar chemicals, wearing long sleeves and pants outdoors, and eliminating standing water to limit mosquito breeding environments. Many infected individuals exhibit no symptoms, but some may develop a fever, headache, and muscle weakness. Severe cases, which are more common in very young or elderly patients, require immediate medical attention. Last year, Iowa recorded 21 West Nile virus cases, including one death.