Weekly Disease Roundup: August 31 – September 7, 2026
As of September 7, 2026, Equine Alert recorded 29 new disease alerts across 12 states over the past week, led by West Nile Virus.
This Week at a Glance
| Metric | This Week | Last Week | Change |
|---|---|---|---|
| Total Alerts | 29 | 29 | 0% |
| States Affected | 12 | — | — |
| Diseases Reported | 5 | — | — |
Activity by Disease
| Disease | Alerts |
|---|---|
| West Nile Virus | 13 |
| Strangles | 8 |
| Eastern Equine Encephalitis | 4 |
| Vesicular Stomatitis | 3 |
| Equine Rhinitis Viruses | 1 |
Activity by State
| State | Alerts | Primary Disease |
|---|---|---|
| Utah | 4 | West Nile Virus |
| Wisconsin | 4 | Strangles |
| Colorado | 4 | West Nile Virus |
| Florida | 4 | Strangles |
| Montana | 3 | West Nile Virus |
| Oregon | 3 | Strangles |
| California | 2 | West Nile Virus |
| New York | 1 | Strangles |
| Washington | 1 | Strangles |
| ?? | 1 | Vesicular Stomatitis |
| North Dakota | 1 | West Nile Virus |
| Michigan | 1 | Eastern Equine Encephalitis |
This Week's Alerts
- September 5 | West Nile Virus | Salt Lake, Utah
- September 5 | Strangles | Delaware, New York — voluntary quarantine
- September 5 | Strangles | Dane, Wisconsin — voluntary quarantine
- September 5 | West Nile Virus | Sutter, California
- September 5 | West Nile Virus | Sacramento, California
- September 4 | West Nile Virus | Hill, Montana
- September 4 | West Nile Virus | Morgan, Colorado
- September 4 | Strangles | King, Washington — voluntary quarantine
- September 4 | West Nile Virus | Brown, Wisconsin
- September 4 | West Nile Virus | Beaverhead, Montana
- September 4 | West Nile Virus | Yellowstone, Montana
- September 4 | Vesicular Stomatitis | Unknown
- September 3 | Vesicular Stomatitis | La Plata, Colorado — official quarantine
- September 3 | Vesicular Stomatitis | Archuleta, Colorado — resolved
- September 3 | Strangles | Marathon, Wisconsin — voluntary quarantine
- September 3 | West Nile Virus | Mountrail, North Dakota
- September 2 | Strangles | Marion, Florida
- September 2 | Eastern Equine Encephalitis | Washington, Florida
- September 2 | Equine Rhinitis Viruses | Josephine, Oregon — voluntary quarantine
- September 2 | Eastern Equine Encephalitis | Washington, Florida
- September 2 | Strangles | Marion, Florida
- September 2 | Strangles | Crook, Oregon — official quarantine
- September 2 | West Nile Virus | Weber, Utah
- September 2 | West Nile Virus | Duchesne, Utah
- September 2 | West Nile Virus | Duchesne, Utah
_…and 4 more. See the full alert list._
Protect Your Horses
Disease activity shifts week to week. A few habits go a long way:
- Check destination states for disease activity before you travel or compete
- Isolate returning horses for 14–21 days when possible
- Monitor temperatures daily — fever is often the first sign of EHV-1
- Avoid nose-to-nose contact and don't share water buckets or equipment at events
- Inspect wounds daily and keep them clean and covered
Want alerts the moment a new outbreak is reported in your state? Sign up for free email alerts or explore the interactive outbreak map. Data sourced from the Equine Disease Communication Center (EDCC).