# First West Nile Virus-Positive Mosquitoes Reported In Chicago This Year

> **Open Intelligence Dossier** · First detected: 2026-06-12 23:07 UTC · Category: Health

## Executive Summary
Chicago area reports first West Nile virus-positive mosquitoes of 2026, prompting early health alerts

## Intelligence Brief
The detections mark the start of seasonal monitoring and public advisories, as mosquito populations typically rise during warmer months. Coverage highlights the importance of preventive measures, though no human cases have been reported at this stage. Local outlets—including MSN, Shaw Local, and Patch—are emphasizing the need for residents to reduce standing water and use insect repellent.


The Lake County Health Department and McHenry County health officials have issued warnings, with Block Club Chicago noting this as the first detection in Chicago proper for 2026. Surveillance efforts are expected to expand as temperatures rise. Next steps include heightened mosquito control efforts and public education campaigns.


Coverage does not yet specify whether additional regions will see detections, but historical patterns suggest broader spread as summer progresses. Residents are advised to monitor local health advisories for updates on testing and prevention strategies.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| WGN-TV | Mosquitoes in Fox River Grove test positive for West Nile Virus | [Source Link](https://news.google.com/rss/articles/CBMiowFBVV95cUxQNlB2ZHpGVDRnVEo5a2J6LTF0M2VUR2RQUG5ZeWtjbmJ6TDU1Q3lCNGRYYXFEaHhXQ19RVUFnWlRyOE1vY05XakdHTTdveVFMT0wtRWxZRFlrSHc4Y1ZKY2ZRcjNHbnJSWmtObnlIZlpGaHFKYVZmbF9nNS1YaURmampQTmhaZlg5dU5qUklDbFJMMll3Z2hLVUpscnV4RmJqUS1F0gGoAUFVX3lxTE5EWjdTbktaektYSWE4SC1ZUzJKTG5uVU1qQ2lwbUM5aHZENHZNX244VlpUX3NPZ2J2ZmxOY28yYXRBOHJqWWFOQU1OT09lMk96S3kxS1p6UmhIYWtDTjlkcUtGX0lNTlpRUkZLNzJnYVlONDJUWVpBeS1XbC1xRnJFZmF4bnR4Q1BKNjNXRHZ1UldTSzc1ZTNydC1iLTFFamdISFVlMjVMeA?oc=5) |
| WSPYnews.com | Mosquitoes Tested Positive For West Nile Virus in Coal City | [Source Link](https://news.google.com/rss/articles/CBMi4gFBVV95cUxPdFZKNHBnbWE5LVlWdDZSRUc0WWZFNF9CdFRoaTFZRXk3U3l2MDU0WGlkX2djajUzWm1SU0Izc08xTXo4RExVU0E0TVoxYUR2UjVLUnYxbWVpLWxPTXlVM3daQUJ4N1JjaU1nMGNaOWxuVmpuWEU2TS1NRjlaT01vMDY2VEJTdnZva2VzVFlPcDFkTVdwOEx4V05ROXhkV2YyMXFrNExKMkFvMW4yVzVGZTBBMVdSSU9wN05oSkItQlBQWTRhbVBvMzZCQUlRb3pSemtvTk12eEVtRkU1cVN5NGJ3?oc=5) |
| Chicago Sun-Times | First West Nile virus cases of the year reported in mosquitoes in Chicago | [Source Link](https://news.google.com/rss/articles/CBMiugFBVV95cUxPcXAwRlNfV0N1R1hUMWVNN3p6YkI4QUZyaDhMQ1JCLTE5dGVtSFVldGwyVDQ1cWRYSm9xVlBNZFhpdWZlY1dPWXgyR0g4bjhVaUJpT1NDOVREVktVTDB4UEc4S25GMTdkdjh0RFlDZXFpbmFQNURaenQ2dWpHU0kzek0wNzIyTm9ETHBsRVJINVl4aTRFNDJ0RHd3aEl4czFrbzJaa1c3VkJ0d3lnVHNSMjlBOVZNM3J1YVE?oc=5) |
| MSN | Mosquitoes in Fox River Grove test positive for West Nile virus | [Source Link](https://news.google.com/rss/articles/CBMitAFBVV95cUxOTHBjMlNDX1RDV3UwWTJIb1QzZDBHcl9LQW9DamI2dkNHS0J4NmNPWTQzQTBQNlAxZnFxdjNfN2ZUYzFQck9Ta1cwNk5VdHhlX1hDQVI4aTlxWW90dU5qUUJhTGhvWFBTUHY5Uko3UDlDUE11QmxYdl8wcS1iZWcxZkU5VXNWam1kSlVzSjdldzlrNExJNEdfTElUZUVaMDdNaTV3TnZyWldtaV9QMERzUVNKZnQ?oc=5) |
| Shaw Local | Fox River Grove mosquitoes test positive for West Nile virus | [Source Link](https://news.google.com/rss/articles/CBMitgFBVV95cUxNWnNuWUlKaHAyZVBQd1NlalZfeXNrZWZMdERQSWVocFVYbE5mYXVLUU9LdTVFdzlSelJfcWJVWnlYeEJZZlZuQXVFaE1PNi1tSXRVM2JQalFReVJBcFJPVDBlUVZNajhObm1LWnpwZ1ZvcmlGVnp3Q3l3T2ZNc3FjMm5PeDB6TGZTZGxBVDZtRTBuaDRlREZ4RC1iNmhzUVh3NVdzM2pzbG1UWnJDNlk5bUM0U09MQQ?oc=5) |
| Lake and McHenry County Scanner | Health department warns after mosquitoes test positive for West Nile virus in McHenry County for first time in 2026 | [Source Link](https://news.google.com/rss/articles/CBMi9AFBVV95cUxPZXc3VldTSmxWQ1Y2TXNKdEVLODRhcFgyNlVfSjM0MkRFRDctWWVZS0xFaWNHS0d0bDRHbzdwamxXYjM2MjhJSC1ZRGE2Q1VuREdqS3RlZ05OTmM4anJPT1FhMWJhZi1PZnpxS1NYS0xqa2dvR3F2VThUSEluOTVLdEkweEFUZ1Z3alVXbGF4WG1xRXMzWmppcUJJSHM3eXhBY0hzTHNuWjIyV0s0a3pHRFZBQlJDdkVJNU9tbWdBTlZRQVptRnFWLVVhWG43aXhRUWRkY0hvOFBiOWt3YUh2ZngyNW5RMWJ2cGhlOUExa19nTTZ1?oc=5) |
| Patch | West Nile Virus Found In Northbrook Mosquitoes | [Source Link](https://news.google.com/rss/articles/CBMiiAFBVV95cUxQdlhkZ3BSaHVyWVlVWWgyLURSWXE0dlhJNzhiR0ZWMkxGbVlzNllUTVhYY2FNX0dXbU04UmktMkozZjNacGJLWWhQUS1QaFA3a01maWJ1a0Eyd0pJQTdESG9RdUR1dzNHN0hybVRvbVpnT085UTZLYkRJb3R0cU9uYTdXY0J0QWN30gGeAUFVX3lxTE0xSHBtbXp2WmVzMGJ1bFlhMnpQT3hwaGZtVUYtWWl3SXJxWmhvUndlcGYzYVZKZ1VEQmhBNDhYVEJKY0lPeTNHWUREZlFyWkl0eTBxVExQMmt3TDZ2TXNZLS0zbnB0cG1vb0w2MU81TEtTQjRRejdpOWNiZzBrVDBOVUh0empTWGtTUEZZZ21PRzVGRExGclRtbUIxM0dB?oc=5) |
| Block Club Chicago | First West Nile Virus-Positive Mosquitoes Reported In Chicago This Year | [Source Link](https://news.google.com/rss/articles/CBMisgFBVV95cUxOT0JTYXdOdDRsOV9sMkl5eWVoMkNDaTNSRGg5d3NvblFPSlFSOXdCNW9EUEdLdF9uaDAwM1JmdlBBTXpHX0hqVUo4MGZ4d3U1OGxoN2haMkFVRHhOeDVsZUFaS1E2eVJXTWN6TUlKekxhd1EzRUdYMU5Sc19WWUZmU3MwRDYwQWVxZnBKZHRPeTBSbHVXRWloZDFZMGtlblNHbzEzRmxSazdXSWFVSzMtdTRB?oc=5) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-06-12/first-west-nile-virus-positive-mosquitoes-reported-in-chicago-this-year*