[CED/CD/EAT] FW: More EHV-1 for horse youth

[Martin, Edward C - (ecmartin)]

Directors,

You should also be made aware of this.

Ed



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Edward C. Martin, Ph.D.
Associate Vice President and Director
Cooperative Extension
Division of Agriculture, Life, & Veterinary Sciences, and Cooperative Extension

Professor/Extension Specialist - Biosystems Engineering
THE UNIVERSITY OF ARIZONA

Forbes Building, Room 301 | 1140 E. South Campus Drive
P.O. Box 210036 | Tucson, AZ 85721-0036
Office:  520-621-7145 |  Cell: 520-709-0939
ecmartin at arizona.edu<mailto:ecmartin at arizona.edu>

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From: 4h-request at list.arizona.edu <4h-request at list.arizona.edu> On Behalf Of "Greene, Betsy - (betsygreene)"
Sent: Sunday, February 1, 2026 12:25 PM
To: 4h at list.arizona.edu
Subject: [4H] More EHV-1 for horse youth

Attention counties with 4-H Horse youth:


***EHV-1 Neuropathogenic/EHM Update***



The AZDA was notified by the attending veterinarian Wednesday night that two horses from Pinal county displaying neurologic signs tested positive with point of care EHV-1 tests on samples collected that evening.  On Thursday, AZDA began reaching out to event organizers requesting information of attendees / registrants or contact info for messaging.  On Friday 1/30/2026, one of the two hospitalized horses was humanely euthanized due to progressive neurologic deterioration.  Confirmation of EHV-1 (neuropathogenic) by the reference lab was reported Friday afternoon.  The events where exposure to the affected horse(s) or dangerous contact (exposed) horses of the affected horses (ie. other horses from the premises of origin of the two clinical horses) are as follows:

January 18, 2026 - Horseshoe Park Extreme Barrel Race

January 20, 2026 - ICE Wittmann Breakaway Roping

January 21, 2026 - Roper Nation Breakaway Roping

January 21, 2026 - John Volken Academy Ranch

January 23, 2026 - TACC Thunderbird Farms Arena

January 24, 2026 - Horseshoe Park Extreme Barrel Race

January 27, 2026 - TACC Thunderbird Farms Arena



As always, many horses even in a normal population may be completely asymptomatic intermittently shedding herpes virus and a smaller subset of those will be shedding neurotrophic herpes (and still may be asymptomatic).  Given the extensive show history that has already occurred it's difficult to be on the leading edge of this like the horses returning to Arizona from the Waco, TX and Guthrie, OK events at the end of November where quarantine of returning horses was more feasible.  In the current situation the best course of action for your clientele if they have had horses at these historical events would be to encourage rectal temperature monitoring twice daily with logging the results to chart trends, prompt reporting of any signs consistent with EHV-1 (respiratory or neuro) infection to their attending veterinarian and testing (nasal swab and whole blood PCR) if indicated, and voluntary self-quarantine from attending any new shows for the next 14 days.  Additional messaging will be forthcoming.


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