# A deadly brain-swelling illness spread by mosquitoes is on the rise in the US

> **Open Intelligence Dossier** · First detected: 2026-08-18 17:07 UTC · Category: Health

## Executive Summary
18 news sources are covering this Health story right now — PULSE is tracking how fast it spreads.

## Intelligence Brief
"A deadly brain-swelling illness spread by mosquitoes is on the rise in the US" is generating significant coverage in the Health category, with 20 articles from 18 distinct sources tracked by PULSE so far.


Outlets currently covering the story include boisestatepublicradio.org, Patch, Yahoo News Canada and Yahoo Health. PULSE measures a story's velocity from how quickly new articles appear and how many independent newsrooms join the coverage.


This brief was generated by PULSE's extractive engine from coverage metadata only. The latest headlines from every source are listed below; the velocity chart shows how the story is developing in real time.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| boisestatepublicradio.org | Idaho Matters Doctor Roundtable: August 19, 2026 | [Source Link](https://news.google.com/rss/articles/CBMitAFBVV95cUxQY0E0VnpQTi14TVAwSnpSblhUbktKb21wcU1ZbGlJdk9TUTlOeVZMY3JoUWNtclJZQUt3aUUtRThMTklDeXlxNThOSllsbV95OWtjcjZ3cXdzRUdzRnRKaUlnTFBRUXFfTjBhZXY5SkhCcDVSTEJKMjN2U3pIbHpvNS14Z01oVDM1ZUZqMklWMEZsWmRwejVJOHotRGRBaW5MbTlkZFBYMnRSY1R5V0lsb1lZdkY?oc=5) |
| Patch | Brain-Swelling Disease Blamed For Recent Deaths In CA As Cases Surge Nationwide | [Source Link](https://news.google.com/rss/articles/CBMirAFBVV95cUxQLTYtRHBNTWNMVF9pUmFEa0ppNGdhekxEaXdIR1FoWXJFOWVhTEh3ZGYxS0NvbzBTcUZveXlaZkV4TkxkRlhuVXI2VXN4cDJDRjQyTWdtVTkyYmMwN0pKckxlbVJRRmx3ZXFyUmxjTUU0TXZBMGFQNFp2WUVoSURrck5DczZzeWFPVXcxd0FTbklzdHEzcjRBc1lRN1p6dklyWEZRNUtMTmJKM3Ru0gHLAUFVX3lxTE9UeTF6VHQ5bmNraEtuYXNFV09oNnNXSGlpc2RsdGFiQTBsbmloNlAzREZFN1ZBeU5vUVlMaTkxRjV2akxfRzNQbmRXZWp2TU12VWdjNkxaN2hXSGt5RU54T2I1REtXQmZiQWhiTERLZHRJd2d5OUt1R2ZpWFBCbjd5YlZUUVFGUlVTZE1idFlqY1M4SWdvZ0k4OGlwSVdFaVdhNy1xSWI) |
| Yahoo News Canada | A deadly brain-swelling illness spread by mosquitoes is on the rise in the US | [Source Link](https://news.google.com/rss/articles/CBMigwFBVV95cUxPS3czajIza0RpVWl3TjVjdlltT2J5WWRBWnNDSmhIel8xaDZqRXhhUDQzVlpsVkxuTXV1YnpXeDJBaUhGR3dIcENRb3p6YUlhVDBZd3lrR3Nqa3AxZXdLSGg2RVVJSm1Ba2ZaSkctQXlMNzd2bThpZl9MTmFHWUhTRXplTQ?oc=5) |
| Yahoo Health | West Nile Cases Are Rising This Summer After 8 Deaths Reported Across the U.S. What to Know Before Your Next Backyard Hang | [Source Link](https://news.google.com/rss/articles/CBMisgFBVV95cUxQUUhVZ2hsazZuSTRCSzIzZUNRc1o1dHB2cGttZTNMcDdvYksyRGM2cV9lb0pqN2dUOVpGSHN3MnA2enZTcWdSekFUTWl3VlB0cjRsUGNCM1MzVU95M3JpQlVWSE1sekw1d0VlYmpzcTBNWm4zSm1idTJjSmItdUpQQktEdTk3b01vR3lpN3lMMW1aRjkxZjI4d2kySjlmOUxhYVR2aUtnODlKZDlDTzZXNzV3?oc=5) |
| Yahoo | Rain brings in more mosquitoes as the West Nile virus poses threat | [Source Link](https://news.google.com/rss/articles/CBMinAFBVV95cUxQQjVvbXlYSWRZanBKVFdHdk82VHIxbmU5NGJsSWE4ZHlOalN0LW5UNVJoQ19MLWhsbXcxQTBVWEpxU0ZyQWRQYXJMVUFzYkxHUEZoV1l3eXhqZmxIdWtaY3ZLdUdzZ0VCZ1lRaktha2dyVG9pdlc1WFJKUDFIeE8yckhLelJMREd0RW5EVXoyb1V0Z2RKMUxTMWFUa0U?oc=5) |
| The Independent | Warning as deadly illness spread by mosquitoes on the rise in the US | [Source Link](https://news.google.com/rss/articles/CBMilgFBVV95cUxONDdzcEt6NzhFc095Y3JtYklLT1ZhRmp4MFc0RllNZlVMZ3hDU0VPcTJYZ1Y5OWVsUDBUUUlFcnhUWE1BQ0lJUWNGUy05QXJHRGpLR1MtVW42ZWttWmFaM29tZk02MlFOVjZ2U1ZHLXZoS3dZWmJfLTdzOTdQYlFobXZWc2J6aHVFTWFpV0hBMTFncjk3NXc?oc=5) |
| KTVB | Idaho officials report season's first serious West Nile case, urge mosquito precautions | [Source Link](https://news.google.com/rss/articles/CBMi0AFBVV95cUxOSXpxSlEwS29FLUVOamtWTWhKNDJzUktXaDhXSGlnZlVCb1hHRE5PRm5MdVpxbEZOdG9oRXBQVE1FYnQyM0NBZGdMbUN4TktLTUlQOXNaQUdPUm52N0VwQ2gwYkM4b255N1VYTlNuN0pxeW80X2ZPcFplM1h4TlZtQzFtYndldFdIdzVZb0YzdnhrNGhJNk9sbXpBZTlBYmktd1ZVbkFSc0Z1S3ZuLTVBMGR5OG9uVUpiU2kwZGpxQ0pTdmpxYWpuZUo4anVfOG4z?oc=5) |
| Idaho Capital Sun | Southwest Idaho resident contracts meningitis from West Nile Virus infection, health officials say | [Source Link](https://news.google.com/rss/articles/CBMizgFBVV95cUxOeDhnOVUyUnE1NnNzZUFfalpUVDZVZmlPRk1lUTJoR2xhMzZ0bklCZWFrTUpBaXpwYlBNS0xXSXdreU9rYTYyUnl6ZF9lbE9fX2F5LTNuY0Y0dDJrRDg5ZE9NUml1X3NEa2ZUWHFuRTZva0d5Q29CbDh6UlV3M0VPTFhhVjZGUlU1T2ZJdEc4UnlfVU5Jc2YtTUV6NTRPaXlWbHR2b1R5TWo5SU1uYVJ1aVZ4T3M1WHBiakM2aFV0SXFBQnRQbk4ya3dLNnZ4Zw?oc=5) |
| Idaho Press | 2026's first case of West Nile meningitis found in Canyon County | [Source Link](https://news.google.com/rss/articles/CBMi3gFBVV95cUxQZlE0M2hEdFcxQkxGaGg2elVyR0RBVHJpR0ZTUWI4N2g2T1pPVkhWT2NXNnhhXzEtUk52SnZKS1ZLTFRFUFJIY19sR3F3TXR2YVBjc2JLS1dzSXQ3clF6N2thbnFfaGdvRzBkUHk1eUg2aDdmUDNXWW53b0R0ZDJsdFlvQUMxb1FrZk1HN2RIRGJOVDdJcVhzbTFGVzNMaF9LV0pmM3hxUVpsX1BCT1NtRGRpbkp4Yno2MERaNm5rdlRJSGlzbVVhTVBSVWZzRzZYZDJ2ektoc09ZOURCUlE?oc=5) |
| KIDO Talk Radio | Idaho Residents Warned After Serious West Nile Virus Case | [Source Link](https://news.google.com/rss/articles/CBMiZkFVX3lxTE4yTTF0azlwM1NESUJnRjRBNEhIQXV1UDdBc3B2Qy0yZ1BPeU5RZ2p2UjNLRXdOR3FReU0wLVplNjd2VFFLdmo0QnV1aXdRUEt2R0xfTm5Rb1ZuMFBpcXVfY1UwRk0zdw?oc=5) |
| Yahoo | A deadly brain-swelling illness spread by mosquitoes is on the rise in the US | [Source Link](https://news.google.com/rss/articles/CBMilAFBVV95cUxNYlVyVW84SGtrTjNwQ2MzcG1VSHVYQ1ZlWlo4eUZWOTFGcWdFSTBWdnIxWkdTQ2YwTjFyTThkSThOcllMMENiREJLZEJ2eDdETDRzRTVtemNUeEJxUDBhVlZvVC0ySmNVOGVBTWVPQjF3cDZWYlNfdTZHTERBbEVCa0JSdHEzS2hFWjM1NTFwdHJzQWY5?oc=5) |
| East Idaho News | First West Nile virus meningitis case reported in Idaho this year | [Source Link](https://news.google.com/rss/articles/CBMipwFBVV95cUxOOFp3MGlVNkx0a0JOUzQ0ODdwMWlmMl9fYlBSUmpERF9PM3dranBlVkdpT2M4eVNqM3o1dVpFMlRUYWI1WG5YS2pqdjNFSTE0NC1pU2pzcHJhY1NtblJLdWdMSHllVkU1ejNqMm5JaGF4b1BWTzJfZXQ1SERzS0dxMDNTMHoxSjExQjdrQk93LW5qV0Jkc3FDQ3pLU1NlNmxXWG1DaFZMRQ?oc=5) |
| CIProud.com | Rain brings in more mosquitoes as the West Nile virus poses threat | [Source Link](https://news.google.com/rss/articles/CBMikwFBVV95cUxOT3Y5OGd5c3VfM2x4WkRhMjRNTWhDSE9mZHlhZkJtV01ZclJRamxxLXc2ZlIzeEVOSGNhRUJGRkVyMTk3T2sxM3FnOU5leUhPY3ZsVkpqOGZmREplajdvX2pjUE40dnZPMERyTF96VHotYjRQdVBoRkJRVk9QTTk0aFJDa0lwRmJSZkhiMDc2LWY4dTTSAZgBQVVfeXFMTjd0aG8tVTBJSTRybS1seUhzYnRGSHpxWGlHY244bjEzVmltTmN6ZDAzdXF6WnkwekYwZmxUWldCbE5HdUFCb2dQN09OR09MeldhMUV5QUFtZUx0d0pFSG1ZVkNDS2hBZUhkSVVSOGNJU2w0dWQ4aWN4V3c4REpTNjlnOVZ2bzVoYnR0ZWx3RGRpSzNiRTdSc1M?oc=5) |
| longmontleader.com | West Nile Virus Returns Every Summer. Here’s Why Boulder County Can’t Eliminate the Risk | [Source Link](https://news.google.com/rss/articles/CBMi1gFBVV95cUxNYXJIckpnQ3ZQZlk0ZlQ0VWxlcS1zRDV1UjZDSzBqWk1tOWRFa2d5Z1Bhel9YeUdJQ3VkbG9jb1ZuTG5sWmh1YjY0YXluTzgtcUFqWmRYYlI4cjV2bTFRbDI0TW5zbDdXV29mcUtYdmlQM1VZYTJuSW1KUjBURFN1andIM3BXOVBzTUlNZ3ViZGFJQTdESkFTWThCelpPM2xadU9CQzF1SFBvQjZ2RDdXZ245ZWtTUVFyWEdSMWlHNUFlSXQ3WlFjRG1LZDFuSGlVa2JHMmNR?oc=5) |
| Newsweek | Map Shows Mosquito-Borne West Nile Virus Spreading Across US, Killing Eight | [Source Link](https://news.google.com/rss/articles/CBMirAFBVV95cUxPN090Ti1jMk9YRk0zTXB3a05KRHJpMkE0ZkExTEhJeUxSNHJXU18wR3pOV3R3UHRKckppSS1LT3hFQXhNOGVFTUtTYmh4QkRZcjMzMUl6OThxUkZKTDRkX3dhMWI0ZTdjVmpuZmVEUkdrcGFVVnN6dXZXQ2NNempDVlVpeWJxd0s2OWpKVFUxalU5eU5MRzB3ZXh0YW9pNnphZkt0RElGc0xIeU9C?oc=5) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-08-18/a-deadly-brain-swelling-illness-spread-by-mosquitoes-is-on-the-rise-in-the-us*