Cache Valley Virus detected in mosquitoes collected in Lancaster County

LINCOLN, Neb. (KOLN) - The Lincoln-Lancaster County Health Department reported Friday that the Cache Valley Virus (CVV) has been detected in mosquitoes collected in the county.

There have been no reported cases of the virus in humans in the county, but residents are advised to keep taking precautions against mosquitoes.

CVV is a mosquito borne disease that is endemic to the U.S. Human disease from CVV is rare with fewer than 10 cases ever reported nationally as of May 2025, the health department said. CVV can result in neuroinvasive disease such as encephalitis and meningitis, long-term health effects, or death.

The health department said although it is an uncommon disease, CVV is a severe disease, and it is important to protect yourself against mosquito bites by following these precautions:

• Use an EPA-registered insect repellent when spending time outside such as those with DEET, picaridin, IR3535, oil of lemon eucalyptus, para-menthane-diol, or 2-undecanone. Click here for more information.
• Limit time outdoors at dusk and dawn when mosquitoes are most active.  
• Wear long-sleeved shirts, pants, shoes, and socks when outside.

There are no vaccines to prevent or medications to treat CVV, according to the health department. Initial symptoms can include fever, headache, nausea, vomiting, fatigue, and sometimes rash. Severe symptoms (encephalitis or meningitis) include stiff neck, confusion, loss of coordination, difficulty speaking, or seizures.

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