# Rare mosquito-borne virus confirmed in the Upstate, officials say

> **Open Intelligence Dossier** · First detected: 2026-08-01 04:07 UTC · Category: Health

## Executive Summary
Health officials confirm rare cases of La Crosse virus and encephalitis across South Carolina's Upstate and East Tennessee.

## Intelligence Brief
Health officials have confirmed the presence of a rare mosquito-borne virus affecting multiple regions in the Southeast. According to reports from WBIR, the Centers for Disease Control and Prevention has identified a case of the La Crosse virus located in Claiborne County. This specific instance is noted as being one of only four total cases identified within the United States. Simultaneously, reports from NTD News and WSPA 7News confirm that this rare virus has been detected in South Carolina, specifically within the Upstate region. Further localized reporting from WNEG Radio and upstatetoday.com indicates that a case of La Crosse encephalitis has been reported in the Westminster area and Oconee, marking a concentrated spread of the illness across these neighboring jurisdictions. Media coverage of the situation is widespread across local and regional outlets.


WSPA 7News and FOX Carolina News are emphasizing the rare and serious nature of the viral illness, focusing on the risks associated with mosquito-borne transmission in the Upstate. WVLT has focused its reporting on the confirmation of the virus in East Tennessee, while WBIR has provided the national context by citing the CDC's data regarding the scarcity of these cases across the country. These outlets are collectively alerting the public to the presence of the virus in specific counties, highlighting the importance of understanding what the virus is and how it spreads within these particular geographic clusters. To understand the significance of these reports, it is necessary to note that the La Crosse virus is characterized in the coverage as both rare and serious. The mention of encephalitis by WNEG Radio suggests a severe manifestation of the virus that affects the brain. Because the CDC identifies only four cases in the entire United States, the emergence of cases in Claiborne County, Oconee, and the Westminster area represents a highly unusual public health event.


The geographical spread from East Tennessee into the South Carolina Upstate suggests a regional pattern of transmission that health officials are currently monitoring to prevent further infections of this particular strain. Looking forward, the focus remains on the continued monitoring of the Upstate and East Tennessee regions to see if more cases emerge. Public health guidance provided by WSPA 7News suggests that residents should seek information on what to know about the virus to protect themselves from mosquito bites. Because the CDC is tracking the total number of cases nationally, any further confirmations in Claiborne County or South Carolina will be critical in determining if this is an isolated cluster or a wider trend. Coverage does not yet specify if there are active containment measures or specific vaccination efforts being deployed in the affected areas of Oconee and Westminster.

## Multi-Source Evidence Table
| Source Outlet | Headline | Verification URL |
|---|---|---|
| WBIR | CDC reports case of La Crosse virus in Claiborne County; One of 4 total cases in US | [Source Link](https://news.google.com/rss/articles/CBMi0gFBVV95cUxPWkE0QVUxclhIeURIcWpQdjZDeEFnTEt4OWhqZWxYNDBRX1VSaU5FRkU3WmJaOHZfXzB5WFpGajZNZEgxaFB5TTdWT2Z1eWFHQzVIZmFsZHR2UTZTLVBqc291Yk9mRVc0ZVFZLXlRaVBEbEx4Qmw3ZXM0dmkyQmdqODI1bDd0RUt1bERDbFh6ZDA5LTlpdzFrWTFCdnVFTzI3eEx2T3FxNUM2Ym1oZFpVTVpRM0I0eVBDRDNta2k1cVJfM0ZNVWkzOUpPVkpneHQxY3c?oc=5) |
| WSPA 7News | What to know about the rare mosquito-borne virus found in the Upstate | [Source Link](https://news.google.com/rss/articles/CBMic0FVX3lxTE9YaW4xLTFFcWp0QUEzSUZuNEJCMmxCaVNzdHRHb3VaN1pCMUJudjNzdHVfM3Z5OEI0bGxrVnN5azB5eDVhYmxZVGw3R25uSV9wZkdXQnNiUHdEaXhuQVhrcE5Uc1BNRy14U1lkb2dsakl4OGPSAXhBVV95cUxOUUI1TENDOFBxOEc4NzE5b0xSQ3BoOVZoYkVZNzhMSTlhM1V6cEt1bWtJUlA1T2gxNzU2M0tfbXV4V1U4T25PVnU5UHFzZ21qQUJhNi11azhvbGhkSXhlV2o2ZHFkMnJ2TE1ZRFdyN21GMXJDWkpIOG0?oc=5) |
| NTD News | Rare Mosquito-Borne Virus Confirmed in South Carolina | [Source Link](https://news.google.com/rss/articles/CBMijwFBVV95cUxNNUxxYkRRQVpnOFVkY0EyNmtqMFBhb2k1eXNobzJTa3dldlB1dTU3Zkx0Q0ZpMkh1bXFwMlpHNWE0UEhHdUVIb3RaTFpEcFRWSjVEczJ2SWQzQ005MlRFMmRvZVUtMUpmQjc5SVcwU2FsN1RMZWVUeGppYU5yUURoU0Y0TWJVRkJvQWMxMWlqSQ?oc=5) |
| WNEG Radio | Confirmed Case of La Crosse Encephalitis Reported in Westminster Area | [Source Link](https://news.google.com/rss/articles/CBMilwFBVV95cUxQVmpQOV9RdnhlQmJ1R2lPTFlmc2hqclFfdkE3UDdHUmtHa1FHYW5NeXYyUEJEUmVEWHRYZUNVY2ZPZ1lmNkZHeDJSTGhuUUxvVTlneFlWVEs2OWw5SFJ2UkFtYWsyblhubC03WTlLSTA1RkNDT0k3Y3FYOXQ4Q2wzTnM2bFVfQ2RZQ2dHMXRnQWhpb3FTSXJ3?oc=5) |
| upstatetoday.com | Case of severe mosquito-borne virus in Oconee | [Source Link](https://news.google.com/rss/articles/CBMiwwFBVV95cUxPdEV1aG5selBHWEVUTGtkT25CVGdBMlB2M3Q2TzR5RHJoMFE2c3RUWHNraTd5Tk5wZGUyb2lkX25feDNVR1RrZnpNZ3N0c29FTnp1dTh6ZDRiSkU5QUVYMTFiR3J5UTBYTzBDb1ZRb0hnUEQ1bWd2VDlnTTFrUVFyUjk2YmNLWVFtRGxkUkJGb2JBVjh0bDlQR2ZlNWV1cGthdGJlUXhERzAwd0FQdTdmTzRJajZoaFpRbV95XzZ3TGNZejg?oc=5) |
| mb.ntd.com | Rare Mosquito-Borne Virus Confirmed in South Carolina | [Source Link](https://news.google.com/rss/articles/CBMijgFBVV95cUxPR0hhZlFRT3NQamxhWlNwcC1PamlzaWRpZ0NoU0hkdnE2WjJPWnNXV1gxNXNJRUo3UFVhX2poU0hZVldTRVVZdzNOZThqaVZlWnVTajZvR0xtWlpZdTZCSWNyOVIteG51bkVPTnZvNEhGUlFXSk1iZng5TUczbTRqTVpXQllzQmdodklGWFZB?oc=5) |
| FOX Carolina News | Case of rare, serious viral illness spread by mosquitos confirmed in Upstate | [Source Link](https://news.google.com/rss/articles/CBMirgFBVV95cUxOcGFsTjZueGJwTzVKMkpodmxyay0zV0FwZlRJOXhFNklZWnlxRVFHV3RncUhBMFFNSXVuZHBLZjBxdUtiUF9kNjFNalZWVUw2TFZzNmdmeHFJTHVfb3IzN2t5VVJ4ZG5COTljeGZjWTEwX0VtampSanZDOHZ1Zm5fVmpiaTdHZzRqV3BHSVFJcmdEdklKN3dDa1N6QnFkOUsySjd6QUM2UEI3MDNMd3fSAcIBQVVfeXFMTW9Jd2YwNGJ0RTBSd05xRUZDX05hYTlWbTh1eG1fRmdfdVFtRndNRDBhekRhQVE1elVQc09xR3VIS3RRbnNYbmp0YzRobGp3cTF5SWRqY1BaOW1McW54eVdCNWpTcmJBVjBvdjIzSzNpNDh2ZlpZVk5NOENIMGVtSEU2YkQxV3lNMmwycUhUMmcydUNSd1Q1RlZvb053Q1BiVnBGNy0) |
| WVLT | Rare mosquito-borne virus confirmed in East Tennessee | [Source Link](https://news.google.com/rss/articles/CBMiigFBVV95cUxNMmhBQ1FYbjBCZWhhM0VpV0JXeU5WTjlGY3d6ZzItUDhnN1N3TDZnVmg5V1RSWWNRT3ZDeTgzWWZSaXR5NjRfUHA1aUVCcVE2SnphUGs3Wm5icTBkZzhzX3k2ZFJsdHNEamVaQkI5a1dialVUdUxkRlR5bGpmbnRxeElvOGRHVUpRLVE?oc=5) |
| WSPA 7News | Rare mosquito-borne virus confirmed in the Upstate, officials say | [Source Link](https://news.google.com/rss/articles/CBMidEFVX3lxTE1jRHFlZktPQmpIQjdTQmZaYVhOMnJRTHVxZjVGMG05UXMzWE9tRGNZZ2VORW5DdmhUaFNXMHptVFRUQmp0bXJCQV9qNElDeG1QdDNqSWdtM0ZhRXJadlNCVWNsSUEtdkhvWTZnVTZFUWoxQmUx0gF6QVVfeXFMT1NrN1padThuemdBdHBxR3hvRzdHWkRQdXhEQ1c4RnQzZGZRdTJTRnBfd281Z1FuZHNRQkJxNjJZYzB5VlF5TngyeEZPNC0yMmtwRkxaY2ktNFZrZldsSFllbi10b01lLUdnbi0tQ1ZSWnZqZFVNZkw0MVE?oc=5) |

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*Canonical Source: https://pulse.byoviral.com/trend/2026-08-01/rare-mosquito-borne-virus-confirmed-in-the-upstate-officials-say*