Rare virus found in mosquitoes in Lancaster County. How rare? Fewer than 10 cases ever reported in U.S.

Cache Valley virus has been detected in mosquitoes in Lancaster County, local health officials said Friday.

The Lincoln-Lancaster County Health Department said it found the virus in mosquitoes collected in the county, but there have been no reports of transmission to humans.

Cache Valley virus is a mosquito-borne illness that is endemic to the U.S. Human disease is rare, according to the Health Department, with fewer than 10 cases ever reported nationally.

But in humans who are infected, it can cause encephalitis and meningitis and lead to long-term health effects or even death.

There are no vaccines or medications for the virus. Symptoms can include fever, headache, nausea, vomiting, fatigue and a rash. Severe symptoms include a stiff neck, confusion, loss of coordination, difficulty