Boulder County confirms first human West Nile virus case this year

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

BOULDER  COUNTY, Colo. — Boulder County Public Health has confirmed the first human case of West Nile virus in the county this year.

A 33-year-old Lafayette man reported having several mosquito bites on his legs and was hospitalized for a week in early August. He is recovering at home.

The man reported a fever, vomiting, neck pain, muscle weakness and tremors on the right side of his body when he was hospitalized.

He was diagnosed with viral meningitis and lab tests later showed he had contracted West Nile virus. It’s unclear where the man was when he was bitten.

West Nile virus is transmitted to humans from the bite of an infected mosquito.

Symptoms typically include fever, extreme fatigue, headache and body aches, but can occasionally also include skin rashes and swollen lymph nodes.

Symptoms generally appear as early as three days and as late as two weeks after being bitten by an infected mosquito.

Although most West Nile infections are mild, serious infections can cause inflammation of the brain and/or meningitis, loss of vision, paralysis, coma, tremors, convulsions and death.

There is no treatment, cure or human vaccination for the virus, but health care providers can treat symptoms to help patients feel better and possibly recover more quickly.

Anyone who experiences the symptoms of West Nile virus should contact their health care provider immediately.

Boulder County Public Health officials urge residents to remember the “4Ds” to protect themselves from mosquito bites and West Nile virus.

  • Use Deet-enhanced insect repellent or alternative including Bite Blocker, Picaridin, oil of lemon eucalyptus, or IR3535.
  • Dress in long sleeves and pants.
  • Avoid the outdoors from dusk until dawn.
  • Drain standing water outside of homes.

“Taking preventive measures is the best thing you can do to avoid mosquito bites and reduce the likelihood of contracting West Nile,” Boulder County Public Health environmental health specialist Marshall Lipps said.

“We’ve had some rain in the area recently, so it’s especially important to drain areas of standing water where mosquitoes breed.”

There were 23 human cases of West Nile virus reported in Boulder County in 2016. Two of those cases resulted in fatalities.

Seven mosquito pools have tested positive for West Nile this year.

In Colorado, most West Nile virus cases are diagnosed in August and September, but cases can be identified as early as May and as late as December.

Generally, the mosquito season is from late April until mid-October, with the end usually signaled by the first freeze in the fall.