The Illinois Department of Public Health (IDPH) has confirmed the first three batches of mosquitoes to test positive for West Nile virus in Illinois in 2023, both in Cook County.
Article continues below
The North Shore Mosquito Abatement District collected a positive batch of mosquitoes in Evanston on May 30 and the Northwest Mosquito Abatement District collected two positive mosquito batches on May 31 in Park Ridge.
The first positive mosquito pool in 2022 was reported on May 24th in Roselle in DuPage County.
No human cases of West Nile virus have been reported so far this year.
“The reports about the first batches of mosquitoes with West Nile virus is a good reminder that this is the time of year when Illinois residents should begin protecting themselves from vector-borne diseases,†said IDPH Director Dr. Sameer Vohra.
“We urge everyone and especially older people and those with weakened immune systems to take precautions to protect themselves and their families from mosquitoes and the viruses they carry by wearing insect repellent and eliminating standing water around their home where mosquitoes breed.â€
Monitoring for West Nile virus in Illinois includes laboratory tests for mosquito batches, dead birds, as well as testing sick horses and humans with West Nile virus-like symptoms.
People who see a sick or dead crow, blue jay, robin or other perching bird should contact their local county or city health department, which will determine if the bird will be picked up for testing.
West Nile virus is transmitted through the bite of a Culex species mosquito, commonly called a house mosquito, that has picked up the virus by feeding on an infected bird. Common symptoms include fever, nausea, headache and muscle aches.
Symptoms may last from a few days to a few weeks.
Most people infected with West Nile virus will not show any symptoms; however, in rare cases, severe illness including meningitis, encephalitis, or even death, can occur.
People older than 60 and individuals with weakened immune systems are at higher risk for severe illness from West Nile virus.
Last year, 44 counties in Illinois reported a West Nile virus positive mosquito batch, bird, horse, and /or human case. While 34 human cases of West Nile were recorded in 2022, with eight deaths, IDPH notes human cases are underreported and do not reflect the actual number of cases. ■