The Mexican Ministry of Agriculture said on October 6th that a new case of cattle infected with spiral flies was discovered in the northeastern region of the country.

The Associated Press quoted a statement from the Mexican Ministry of Agriculture as reporting that the infected cattle came from southern Mexico and were intercepted while being transported to the town of Monte Morelos, Nuevo León. Nuevo León is located in northeastern Mexico and borders Texas in the United States.

Quarantine personnel said that according to regulations, livestock need to take compulsory measures such as pest control before transportation, so when this case was discovered, the spiral maggots on the cow were already dead or dying. In addition, no other animals transported in the same batch were infected.

Mexico's Ministry of Agriculture and other departments recently provided guidance to the animal husbandry industry to use specialized drugs to kill insects 72 hours before transporting cattle.

This is the second case of spirulina myiasis recently confirmed in Mexico. On September 21, Mexico found a case of spirulina infection in a cow from Veracruz on the Gulf Coast in the town of Savinas Hidalgo, Nuevo León.

Both recent cases were found in Nuevo León. However, the Mexican government department said that the two cases were not related.

Official statistics in Mexico show that 6,703 cases have been confirmed in animals since the outbreak in November 2024, as of September 13, 2025.

U.S. Secretary of Agriculture Brooke Rowlands said on social media that the new cases in Mexico are believed to be "individual cases" and the U.S. will send people to independently verify the situation.

The U.S. suspended imports of live cattle, horses and cattle from Mexico from May 11, after a brief resumption of imports in July, and again due to a new case in Veracruz, Mexico.

Meanwhile, the Mexican government and livestock industry are seeking to lift the U.S. ban on the import of live livestock from Mexico, which, ifined by the end of the year, would cost the Mexican livestock industry as much as $400 million.

Spiral myiasis is a disease triggered by the larvae of the spiral cone fly, which lays its eggs in open wounds in homothermic animals, including humans. After hatching, the larvae enter the wound and feed on living tissue, thus causing disease, which can lead to death in severe cases.

The disease has plagued the U.S. livestock industry for decades until the 1960s and 1970s, when sterilized female flies were bred and placed in the U.S. for coupling with wild female flies, to root out the disease.

The U.S. has not confirmed an animal infection with spiral flies this year, but the disease¡¯s spread and spread to the north in Central America and Mexico has alarmed U.S. livestock farmers.