The diarrhea parasite isn’t the only bug we need to worry about.
Boulder County Public Health announced yesterday it has confirmed a human case of West Nile Virus in a Longmont resident. The health agency believes the individual was likely exposed while at home. This is Boulder County’s first WNV case of 2026.
Good news and bad news:
The infected individual has since recovered. While the presence of WNV is never welcome news, BCPH says most people infected with the virus never see symptoms. But, if you’re one of the unlucky few, you may develop…
Fever, headache, and body aches.
Skin rash or swollen lymph nodes.
In severe cases: Neurological illnesses including encephalitis and meningitis.
Most symptoms develop between 3-14 days after an infected mosquito bite.
Zooming out:
According to the Colorado Department of Public Health…
Colorado has recorded just two other WNV cases in 2026. One in Jefferson County, the other in Larimer County.
286 cases were recorded across Colorado in 2025.
Boulder, Larimer, and Weld counties historically record the most WNV cases in all of Colorado. Since reporting began in 2003, Boulder has seen 913 cases — including 38 last year — Larimer has recorded 1,122, and Weld has 962.