Biosecurity brings together everyday observation, reliable identification and clear communication when a disease concern arises. For breeding horses and horses traveling to competitions, those subjects belong in the same conversation. The guidance below explains USEF's microchip and competition veterinarian rules and the dated New World screwworm reports published by USEF and the Equine Disease Communication Center (EDCC).
A useful approach begins with practical questions: which horse does a record describe, what has changed since the last observation, and who needs to hear about a concern? Keep identification details available alongside observations so that a discussion with a veterinarian can focus on the horse and the changes being noticed.
Identification and observation serve different purposes. USEF describes permanent identification as useful during an infectious-disease outbreak, while the EDCC's June 2026 screwworm guidance emphasizes daily checks for wounds and unusual signs. Neither task replaces the other. A competition record can identify a horse, and a daily check can reveal something that needs veterinary attention. Planning for both gives owners a clear set of questions to address before a journey or entry.
In its March 20, 2026 explanation of microchips and biosecurity, US Equestrian says implementation of its requirement was delayed from December 1, 2025 to December 1, 2026. Starting on the latter date, horses must have a 15-digit, ISO-compliant microchip number on file with their USEF record to enter a licensed competition.
Competition organizers must check that a number is on file at the time of entry. They are not required to scan horses when they arrive on the grounds. The practical question for an owner is therefore whether the number is recorded with USEF, alongside confirmation of the horse's microchip details. Do not leave that record check until arrival; consider it when preparing the entry information.
USEF explains that the purpose is permanent identification during an infectious-disease outbreak rather than pedigree verification. When an infectious disease is detected at a show, animal health officials need to work out which horses may have been exposed. Pedigree papers and competition identification answer different questions, so review the USEF record separately when buying a horse or planning to compete.
USEF's June 23, 2025 rule-change announcement describes GR843, Veterinary Services on Competition Grounds. Effective December 1, 2025, the rule requires veterinarians treating horses on competition grounds to register with the Federation. It does not require them to become USEF members.
The stated purpose is communication: event organizers need information for reaching practicing veterinarians about disease outbreaks, biosecurity and rule compliance. Owners preparing for a show can include this registration requirement in their discussion with the veterinarian who will attend the horse there. Registration and horse identification are distinct requirements, each addressing a different part of competition preparation.
The EDCC's June 4, 2026 alert reports that USDA confirmed New World screwworm on June 3 in the umbilical area of a calf in Zavala County, Texas. USEF's September 10, 2026 equine notice then reports the first equine case of the 2026 incursion: detection on September 9 on the hind limb of a working ranch horse in Presidio County, Texas.
USEF describes New World screwworm as an infestation caused by fly larvae that feed on living tissue. Its September notice emphasizes that even small cuts and sores should be checked closely until fully healed. These reports describe specific detections on specific dates. They should be read with their publication dates attached when considering a later journey, rather than treated as a complete account of disease conditions at every destination.
The EDCC's June 4, 2026 guidance for owners advises daily checks for wounds, drainage, foul odor and unusual irritation. It also emphasizes consistent fly control, good stable hygiene and careful monitoring after injuries or surgery, explaining that screwworm flies are attracted to open wounds and body openings.
Use those observations to make a clear account of what has changed: where the wound is, whether it is worsening, and whether an odor, drainage or visible maggots are present. The EDCC advises contacting a veterinarian immediately if a wound worsens quickly, smells bad or contains maggots. The signs are reasons to seek evaluation; they are not a diagnosis an owner needs to establish before calling.
USEF states that suspected cases must be reported to state and federal animal health officials. Its June 2026 notice also says that movement restrictions or requirements for horses may follow confirmation in the United States. Check the applicable guidance when considering travel, and discuss concerns with a veterinarian rather than assuming a dated alert settles a later movement decision.
Refer to the dated EDCC alert and USEF notice above when reviewing screwworm guidance. Read the detection date separately from the publication date, and distinguish a confirmed report from advice about what owners should watch for. Before competition travel, bring together the horse's USEF identification record, questions for the attending veterinarian and any observations needing attention. That preparation keeps the record requirement and the reporting guidance clear.
For preventive care, nutrition and routine management, continue with the horse health guide.
Horse Health Guide