West Nile Virus-Positive Mosquitoes Found in Chicago
CHICAGO — For the first time this year, mosquitoes testing positive for West Nile virus have been reported in Chicago, as noted by the Chicago Department of Public Health on Friday.
These mosquitoes are capable of transmitting the virus to humans through bites; however, the health department’s announcement indicated that no human cases have been detected in Chicago thus far this year.
Earlier, in mid-May, state health officials reported similar findings of West Nile-positive mosquitoes in other areas of Illinois.
While most mosquitoes aren’t carriers of the virus, the likelihood of contracting West Nile from a mosquito bite peaks from June to October, aligning with the height of mosquito season, according to the Centers for Disease Control and Prevention.
Interestingly, many people infected with the virus may not exhibit any symptoms. However, roughly 20% may experience fever and flu-like symptoms, as outlined by the city health department. Severe cases can occur in about 1 in 150 individuals, primarily affecting older adults, especially those over 55 with weakened immune systems.
Symptoms typically manifest two to six days after an infected bite. They can include fever, headaches, body aches, vomiting, diarrhea, and even rashes. Some affected individuals may feel exceptionally fatigued or weak for months. The severe cases could lead to hospitalization or, in extreme situations, death.
While mild cases generally resolve completely, lingering fatigue and weakness can persist for an extended period. Additionally, severe infections may affect the central nervous system, escalating the risk of hospitalization or fatality.
There are currently no approved medications or vaccines to prevent or treat West Nile virus. Therefore, the best defense remains safeguarding against mosquito bites, as emphasized by Dr. Janna Kerins, medical director of the Chicago Department of Public Health. She urged residents to take precautions to ensure a safe summer.
To minimize the risk of mosquito bites, the Chicago Department of Public Health suggests:
- Applying EPA-registered insect repellent as directed.
- Wearing long sleeves and pants when outdoors during dusk and dawn.
- Ensuring that window and door screens are intact.
- Using air conditioning to manage indoor mosquito populations whenever possible.
- Keeping grass and weeds trimmed to reduce mosquito hiding spots.
- Regularly emptying items that harbor standing water, like flowerpots or birdbaths.
The department states that Chicago has a comprehensive program aimed at preventing and controlling West Nile virus. This includes treating over 80,000 catch basins, testing mosquitoes weekly, spraying insecticides to kill adult mosquitoes, and monitoring human infections.
Residents can find additional information through the Chicago Department of Public Health and the CDC.
