LLCHD Reports Detection of Cache Valley Virus in Lancaster County

LLCHD Reports Detection of Cache Valley Virus in Lancaster County

Published on September 19, 2025

The Lincoln-Lancaster County Health Department (LLCHD) today reported the detection of Cache Valley Virus (CVV) in mosquitoes collected in Lancaster County. Although there have been no reported cases of the virus in humans in the county, residents are advised by the LLCHD to keep taking precautions against mosquitoes.

CVV is a mosquito borne disease that is endemic to the United States. Human

disease from CVV is rare with fewer than 10 cases ever reported nationally as of May 2025. CVV can result in neuroinvasive disease such as encephalitis and meningitis, long-term health effects, or death.

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. Visit epa.gov/insect-repellents 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. 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.

The Health Department also reminds residents to reduce mosquitoes in and around their homes:

• Dump small wading pools daily and maintain swimming pools properly.
• Clear debris, weeds, and litter from drainage ways.
• Change water in birdbaths weekly and pet bowls daily.
• Store tires, buckets, and containers where they can't collect water.
• Fill low spots in yards.
• Maintain garden ponds and fountains and always keep water flowing.

For questions about mosquito borne diseases, mosquito control, and standing water or report mosquito breeding site complaints, contact LLCHD at 402-441-8002.