West Nile virus human case reported in Clark County

The Mad River Twp. The resident exposure is said to have taken place in Clark County, according to the CCCHD. This marks the first human case of the virus in Clark County since 2018, when two human cases were documented, and the fourth human case of the West Nile virus since 2013, CCCHD said.

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Dozens of mosquito samples collected by CCCHD over the past four weeks tested positive for West Nile virus, and CCCHD reported on Aug. 10 that WNV-infected mosquitoes were widespread across the area, the newspaper said Message.

Seven other samples tested positive from across the county this week. These samples were added to the growing list of West Nile virus positive mosquitoes identified in Clark County last month, the news release said.

Mosquitoes that are sampled and collected across the county are submitted to the Ohio Department of Health (ODH) as part of the county’s vector-borne disease program.

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The best way to avoid getting West Nile virus infection is to prevent mosquito bites, and the best way to avoid being bitten by a mosquito is to eliminate habitats where mosquitos are located Can survive and reproduce, said CCCHD. Other methods of preventing bites include applying repellants to exposed skin; wear long sleeves and pants or stay indoors; look for travel advice when traveling; to have repellent and long clothing on hand; Do outdoor activities when mosquito activity is less common; Make sure the screens on windows and doors are free of holes or cracks, or opt for air conditioning instead of opening windows.

Letting local residents help clean up stagnant water is the most effective means of reducing the overall mosquito count and is far more effective than spraying.

In response to the confirmed presence of West Nile Virus, CCCHD is:

  • Inspect the affected area and work with landowners to reduce brood sources by draining standing water or treating standing water with products containing Bacillus thuringiensis israelensis. Bti is safe for humans and animals and only affects the mosquito larvae.
  • Spray the affected area with Duet® to reduce the adult mosquito population if weather permits. While it is safe for people and pets, residents who have concerns about nebulization can opt out by calling 937-390-5600 or emailing the request and their address to [email protected]
  • The area will continue to be monitored for the West Nile virus.

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The West Nile virus is most commonly transmitted by infected mosquitos and can lead to high fever, encephalitis (inflammation of the brain), or meningitis (inflammation of the membranes of the brain and spinal cord).

Mosquitoes become infected when they feed on infected birds. Infected mosquitoes can then transmit the virus to humans and other animals when they bite, the statement said.

About 80% of people infected with WNV show no symptoms at all, but there is no way to know in advance if you will develop a disease. Those who develop symptoms usually do so three to 14 days after the infected mosquito bites, the statement said.


Larry Shaffer, the director of environmental health for Clark County’s Combined Health District, scans the surface of the water at Old Reid Park as he searches for mosquito larvae in July 2020. BILL LACKEY / STAFF

There is no specific treatment for West Nile virus infection and treatment will vary based on symptoms. About one in 150 people infected with the virus becomes seriously ill. The severe symptoms may include high fever, headache, stiff neck, drowsiness, disorientation, coma, tremors, convulsions, muscle weakness, loss of vision, numbness, and paralysis. These symptoms can last for weeks and neurological effects can be permanent. Up to 20% of people who become infected have symptoms such as fever, headache, body aches, nausea, vomiting, and sometimes swollen lymph glands or a rash on the chest, stomach and back. Symptoms can last a few days or up to several weeks, CCCHD said.

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