West Nile virus detected in mosquitoes in Marion, Hamilton counties


INDIANAPOLIS (WTHR) - Health officials in Marion and Hamilton counties say mosquitoes have tested positive for West Nile virus in their counties.

The counties are the third and fourth in Indiana to have mosquitoes test positive for the virus, though no human cases have been reported. Two human cases were reported in Marion County last year.

Marion County officials plan to increase prevention efforts during daylight and evening hours where the infected mosquitoes were found. Truck-mounted spraying will be conducted in areas of Hamilton County where the mosquitoes were located.

From the Hamilton County Health Department:

  • All spraying activities are weather forecast dependent related to precipitation and wind speed.
  • All spraying has an approximate start time of 8:30 p.m or local sunset.
  • In the event of inclement weather (high winds or precipitation) individual routes will be rescheduled on the following business day.
  • Please be aware that nuisance biting activity is increasing and that the Hamilton County Health Department only adulticide sprays for mosquitoes in known areas of positive West Nile Virus activity.

They're also asking people to use sprays containing DEET when outdoors in the county.

In America in 2018, 137 people died after contracting the virus and thousands fell ill.

Most people (8 out of 10) infected with West Nile virus do not develop any symptoms.

According to the CDC, symptoms include:

  • Symptoms of severe illness include high fever, headache, neck stiffness, stupor, disorientation, coma, tremors, convulsions, muscle weakness, vision loss, numbness and paralysis.
  • Severe illness can occur in people of any age; however, people over 60 years of age are at greater risk. People with certain medical conditions, such as cancer, diabetes, hypertension, kidney disease, and people who have received organ transplants, are also at greater risk.
  • Recovery from severe illness might take several weeks or months. Some effects to the central nervous system might be permanent.
  • About 1 out of 10 people who develop severe illness affecting the central nervous system die.