Two children in Knox County, Tennessee, are recovering at home after being hospitalized with La Crosse virus — a rare, mosquito-borne illness that can lead to serious neurological complications in severe cases. Health officials confirmed these are the first cases of the virus reported in the county this year.
Details of the recent cases:
- The Knox County Health Department reported that both children were hospitalized earlier in July.
- They have since been discharged and are now recuperating at home.
- These are the first confirmed La Crosse virus cases in Knox County for 2025.
La Crosse virus overview:
La Crosse virus is transmitted by mosquitoes and is most common during late spring through early fall when mosquitoes are most active.
Most infected individuals experience mild or no symptoms. In rare instances, the virus can lead to encephalitis, or inflammation of the brain, which may require hospitalization.
Additional confirmed case in Ohio:
A 66-year-old man in Ohio was also recently confirmed to have contracted the virus, highlighting its reach beyond Tennessee.
National context and data:
- The CDC estimates 30 to 90 La Crosse virus cases are reported annually in the U.S.
- Due to under-reporting of mild cases, the actual number of infections is believed to be significantly higher.
- Nearly two dozen states reported cases during recent mosquito seasons.
Other affected states include: Alabama, Florida, Georgia, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maryland, Michigan, Minnesota, Missouri, Mississippi, Rhode Island, South Carolina, Texas, Virginia, and Wisconsin.
Health authorities urge the public to take precautions against mosquito bites, especially during the warmer months.
As mosquito activity continues during summer, health departments emphasize vigilance and preventive measures to limit the spread of mosquito-borne illnesses like La Crosse virus.
