Equine Disease Communication Center

June 12, 2026
Strangles
Okanogan County, WA.
Alert ID: 5036
Confirmed Case: No Quarantine
Source: Asst State Veterinarian-WSDA
Number Confirmed: 2;
Number Suspected: 1;
Number Exposed: Unknown;
Facility Type: Private Facility;
Comments: Under veterinary care.;

For more information go to:

Strangles | Equine Disease Communication Center The upper respiratory disease commonly referred to as strangles is caused by Streptococcus equi subsp equi. Strangles is spread from horse to horse through direct contact. Horses can also contract the disease by coming into contact with contaminated surfaces. The disease is highly infectious.

ATTENTION: New World Screwworm Webinar Alert
When: June 18 at 4 p.m. ET.

US Equestrian is partnering with AAEP to bring horse owners the information you need to know about the risk to horses and how to keep our equine partners safe.

Dr. Katie Flynn, EDCC veterinarian and senior staff veterinarian for equine health and biosecurity at USEF, will be joined by Dr. Neil Gray, sport horse practitioner in California.

Webinar registration link: https://usef.zoom.us/webinar/register/WN_uwgRdUs4Rx-gEHPiBfqvSQ?fbclid=IwY2xjawSX5eJleHRuA2FlbQIxMABicmlkETFpU3Y1QTZXTlZQcUNZRU1Ec3J0YwZhcHBfaWQQMjIyMDM5MTc4ODIwMDg5MgABHimT7JW4DP_qW2jLyzZi4R7Pboo2mW--86A3nSj9-1p9O7-sw1Ufpb3JcNGX_aem_uyNchhf3XuUczpwnP-s4Sw #/registration

🚨 WEBINAR ALERT!
📅 June 18 @ 4 PM ET

On June 3, 2026, the U.S. Department of Agriculture confirmed New World Screwworm in the umbilical area of a calf in Zavala County, Texas. This expansion into the United States is alarming.

US Equestrian is partnering with the AAEP to bring you the information you need about the risk to horses and how you can keep your equine partners safe.

Dr. Katie Flynn, Senior Staff Veterinarian for Equine Health and Biosecurity at USEF, will be joined by Dr. Neil Gray, sport horse practitioner in California.

Webinar registration link: https://usef.zoom.us/webinar/register/WN_uwgRdUs4Rx-gEHPiBfqvSQ #/registration

Check out this post from the AAEP regarding several pesticides currently registered by the Environmental Protection Agency for use against screwworm. For a full list of approved products and their associated species, visit:https://www.aphis.usda.gov/.../files/pesticides-for-nws.pdf

Several pesticides are currently registered by the Environmental Protection Agency for use against screwworm. Examples of approved equine-labeled products and their active ingredient include the following listed on the graphic. For a full list of approved products and their associated species, visit:https://www.aphis.usda.gov/sites/default/files/pesticides-for-nws.pdf

An example of an approved product for the outside surfaces of buildings and perimeter treatment is EP152 EW Insecticide (Environmental Science US LLC) with active ingredient Zeta-Cypermethrin. Additionally, DeltaGard Fly Insecticide products (Environmental Science US LLC) with active ingredient Deltamethrin is approved for this use.

The AAEP has also published New World Screwworm Infestation (Disease) Guidelines. View this resource here: https://aaep.org/resource/aaep-infectious-disease-guidelines-new-world-screwworm/

The American Association of Equine Practitioners has published New World Screwworm (NWS) infestation (disease) guideline in response to the confirmation of NWS inside the United States.

In response to the recent confirmation from the USDA of the presence of New World Screwworm in the United States, the AAEP has published New World Screwworm Infestation (Disease) Guidelines.

View the guidelines here: https://ow.ly/SNsM50Z92rh

Check out these links for additional resources and information regarding New World Screwworm (NWS).

Please reference the following resources for additional information regarding New World Screwworm (NWS):

1. Equine Disease Communication Center Factsheet: https://equinediseasecc.org/handler/managedfilehandler.ashx?id=103&ext=pdf

2. USDA Map of Current Outbreak: https://www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/current-status?page=1

3. USDA Myth Buster Sheet:https://www.aphis.usda.gov/sites/default/files/nws-myth-busters.pdf

4. USDA New World Screwworm Webinar for Animal Industry: https://youtu.be/0ZdBU0mBXKE?si=Vi7_Aqe8V-3Jy72X

5. AAEP Alert to Equine Practitioners: New World Screwworm Enters the United States:https://aaep.org/wp-content/uploads/2026/06/Alert-to-Equine-Practitioners-FINAL.pdf

June 9, 2026
Equine Influenza
Columbia County, WI.
Alert ID: 5033
Confirmed Case: No Quarantine
Source: Wisconsin Department of Agriculture, Trade and Consumer Protection
Number Confirmed: 1;
Number Euthanized: 1;
Horse 1:
Age: 20;
Gender: Gelding;
Breed: Grade;
Onset of Clinical Signs: 6/1/2026;
Clinical Signs: Fever, urine dribbling;
Confirmation Date: 6/5/2026;
Horse Status: Euthanized;
Vaccination Status: Status Unknown;
Comments: Horse came from a local dealer/kill pen rescue. No other horses on site. Euthanized in part due to presumed chronic neurologic condition.

For more information, go to

Equine Influenza | Equine Disease Communication Center Equine Influenza is a highly contagious though rarely fatal respiratory disease. The virus is distinct from influenzas viruses in other species. The most common form of transmission is airborne droplets in  from affected horses. 

USDA Launches New World Screwworm Dashboard

The United States Department of Agriculture Animal Plant Health Inspection Service has launched a dashboard to provide an up-to-date snapshot of confirmed New World screwworm (NWS) animal and wild fly detections in the United States.

The dashboard captures individual animal cases by county and state, animal type and species, confirmation date, and status.

Check the USDA dashboard page https://www.aphis.usda.gov/animals/animal-health/livestock-and-poultry-disease/current-status/us-confirmed-cases-new-world

To learn more, visit the EDCC NWS disease page. https://www.equinediseasecc.org/new-world-screwworm

New World Screwworm | Equine Disease Communication Center New World Screwworm (NWS)  infestation  is caused by NWS fly larvae (Cochliomyia hominivorax). These maggots consume living tissue or flesh of warm-blooded animals (including horses) by burrowing into and tearing tissue by hooks on the larva. The screwworm fly lays eggs in open wounds. Eggs are ...

June 9, 2026
Equine Influenza
Iowa County, WI.
Alert ID: 5031
Confirmed Case: Voluntary Quarantine
Source: Wisconsin Department of Agriculture, Trade and Consumer Protection
Number Confirmed: 1;
Number Suspected: 1;
Number Exposed: 1;
Facility Type: Private Facility;
Horse 1:
Age: 9;
Gender: Mare;
Breed: Quarter Horse (QH);
Usage: Barrel Racing;
Onset of Clinical Signs: 6/3/2026;
Clinical Signs: high fever, dry cough;
Confirmation Date: 6/5/2026;
Horse Status: Recovering;
Vaccination Status: Unvaccinated;

For more information, go to

Equine Influenza | Equine Disease Communication Center Equine Influenza is a highly contagious though rarely fatal respiratory disease. The virus is distinct from influenzas viruses in other species. The most common form of transmission is airborne droplets in  from affected horses. 

June 9, 2026
Equine Herpesvirus-Neurologic
Simcoe County, ON.
Alert ID: 5032
Confirmed Case: Voluntary Quarantine
Source: OMAFA
Number Confirmed: 1;
Number Exposed: 15;
Number Euthanized: 1;
Horse 1:
Age: 18;
Gender: Gelding;
Breed: Thoroughbred (TB);
Onset of Clinical Signs: 6/6/2026;
Clinical Signs: This gelding developed edema of all four limbs on June 6. His signs progressed to acute hindlimb ataxia and bladder paralysis and he was taken to an equine referral hospital that day. He became recumbent on June 8 and was euthanized. Nasal swab was positive for EHV-1 by PCR.;
Confirmation Date: 6/8/2026;
Horse Status: Euthanized;
Vaccination Status: Vaccinated;
Comments: The facility owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present EHV-1 neurologic (EHM) cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal;

For more information, go to https://equinediseasecc.org/equine-herpesvirus

Equine Herpesvirus | Equine Disease Communication Center Equine herpesvirus (EHV) is a family of equine viruses named by numbers including EHV-1, 2, 3, 4 and 5 with EHV-1,3,4 posing the most risk for domestic horses. EHV is a common DNA virus that occurs in horse populations worldwide. The two most common species are EHV-1 and EHV-4.