Ranchers across the Rio Grande Valley said they are on high alert after a new case of the parasitic New World screwworm was detected in the town of Sabinas Hidalgo in the Mexican state of Nuevo Leon.

It’s about 70 miles from the Starr County border city of Roma.

Texas leaders said the parasite can cripple the livestock industry. if it makes its way to the Valley.

Congressman Henry Cuellar, who represents Starr County, said the state and federal government have been working to keep the pest out of the Valley.

The parasite attacks warm-blooded animals, including humans. The pest is carried on larvae laid by flies on the wounds of cattle, causing a possible fatal infection that can spread.

Mexico has reported more than 500 active cases in cattle across southern states, triggering the Uni

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