New World Screwworm: Inquiries on Travel of Animals

News,

UPDATE: Trade Restrictions in Effect for Pet Dogs to Mexico Due to New World Screwworm

APHIS has received updated guidance from SENASICA Mexico allowing for pet dogs to travel to Mexico according to previously established procedures while updated requirements are under negotiation. The following guidance will be updated on our public-facing IREGs and Pet Travel Website pages to reflect APHIS’ current understanding of export restrictions to Mexico:

NEW WORLD SCREWWORM NOTICE

Due to the detection of New World screwworm (NWS, Cochliomyia hominivorax) in the United States, effective immediately, halt exports of the following species from all U.S. States until we have further information from Mexico:

  • Cattle (slaughter and reproduction)
  • Wild ruminants (non-bovine)
  • Equine (slaughter, breeding/work, and sport/exhibition/transit)
  • Sheep and goats (slaughter and reproduction)
  • Swine (reproduction)
  • Ferrets (commercial and pets)
  • Songbirds/ornamental birds/raptors (commercial and pets)

PET DOGS—UPDATE (June 10, 2026)

Pet dog travel to Mexico will proceed according to previously established procedures. Updated requirements will be posted to the Pet Travel Website once they are finalized.

ADDITIONAL GUIDANCE

As of November 22, 2024, Mexico is considered to be affected with screwworm. All dogs (including U.S.-origin dogs returning to the United States after traveling to Mexico) must meet APHIS requirements for screwworm freedom certification upon entry (re-entry) into the United States. Additional information can be found on the APHIS Dog Import Website.

  • All NWS related travel restrictions as relayed to USDA APHIS by US trading partners are being noted on the USDA APHIS webpages below.
  • APHIS is still working with many trading partners, including Mexico, to clarify the restrictions/updated requirements. The USDA APHIS webpages will be updated just as soon as new information is received.
  • They are asking that people not contact the USDA APHIS offices for additional information about country-specific restrictions, because USDA-APHIS doesn’t have additional information beyond what is posted to their webpages.
  • USDA APHIS wants to emphasize that they are working quickly as possible with US trading partners and they appreciate patience and understanding as they work through complex issues.