Granville mosquitoes test positive for West Nile virus

The Putnam County Health Department confirmed that mosquitoes collected Thursday in Granville have tested positive for West Nile virus.

“We are urging the public to use precautions against mosquito bites while attending outdoor events,” Bureau, Putnam and Marshall County Health Department Administrator Hector Gomez said. “Common symptoms include fever, nausea, headache and muscle aches; however, severe illness including meningitis or even death can occur in rare cases.”

People older than 50 or those with compromised immune systems are at higher risk of severe illness from the virus. The Illinois Department of Public Health reported the first Illinois West Nile virus death of 2024 earlier this week. A Lake County man in his 80s began to exhibit West Nile virus symptoms in mid-August and died soon after.

About 80% of people infected with West Nile virus do not develop any symptoms.

Febrile illness (fever) occurs in some people. About 1 in 5 people who are infected develop a fever with other symptoms such as headache, body aches, joint pains, vomiting, diarrhea or rash. Most people with this type of West Nile virus disease recover completely, but fatigue and weakness can last for weeks or months.

Serious symptoms are seen in a few people. About 1 in 150 people who are infected develop a severe illness affecting the central nervous system such as encephalitis (inflammation of the brain) or meningitis (inflammation of the membranes that surround the brain and spinal cord).

West Nile virus is transmitted through the bite of the common house mosquito. Taking simple precautions can help avoid bites from these mosquitoes, which are more common in urban and suburban settings.

Tips for reducing mosquitoes around homes

Mosquitoes require water for reproduction. The following are measures that can help reduce mosquitoes:

• Eliminate standing water suitable for mosquitoes. Dispose of water-holding containers, such as ceramic pots, used tires and tire swings.
• Drill holes in the bottom of containers such as those used for recycling.
• Clean clogged roof gutters.
• Turn over objects that may trap water when not in use, such as wading pools and wheelbarrows.
• Change water in bird baths on a weekly basis.
• Clean and chlorinate swimming pools. When pools are not in use, use pool covers and drain when necessary.

Tips for avoiding mosquito bites when outdoors

Mosquitoes require a blood meal for reproduction. The following are measures that can help reduce bites from mosquitoes that feed on people:

• Minimize outdoor activities at dusk and dawn, when mosquitoes are most active.
• Wear shoes, socks, long pants and long-sleeved shirts. Clothing material should be tightly woven and loose fitting.
• Use mosquito netting when sleeping outdoors.
• Consider the use of Centers for Disease Control and Prevention-recommended mosquito repellents containing DEET, picaridin, oil of lemon eucalyptus, IR3535, or 2-undecanone, and apply according to directions when it is necessary to be outdoors.
• When using DEET, use the lowest concentration effective for the time spent outdoors (for example, 6% lasts about two hours and 20% for four hours) and wash treated skin when returning indoors. Do not apply under clothing, to wounds or irritated skin, the hands of children or to infants younger than 2 months old.
• Be sure door and window screens are tight fitting and in good repair to avoid mosquito bites when indoors.