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Animal rescue leaders say new rules meant to prevent the spread of the livestock parasite make sense. But they are also costly for overcrowded shelters in Texas, which transfer many pets to other states.

The latest confirmed infestation was found in a sheep in Sutton County, adding to concerns that the flesh-eating parasite is spreading beyond South Texas.

Eight cases have now been confirmed in Texas as officials expand surveillance efforts, release millions of sterile flies and mobilize resources to stop the flesh-eating parasite from spreading.

State officials and researchers warned Texas lawmakers in May that New World screwworm was advancing toward the state and could carry a billion-dollar economic toll.

Federal officials say rapid reporting is critical to stopping the flesh-eating parasite from becoming established in Texas. Miller suggested some ranchers may hesitate to report cases because of quarantine restrictions.

There is at least one confirmed case found in South Texas. What can you do to protect your pets?

Officials are increasing trapping efforts, establishing quarantine zones and releasing millions of sterile flies after New World screwworm was confirmed in South Texas.

The detection marks the first U.S. case of New World screwworm since the parasite was eradicated in the 1960s.

The preemptive declaration will establish a joint Texas New World Screwworm Response Team.