New World screwworm

Forty-nine New World screwworm infestations have been confirmed in the U.S. since the outbreak began, including 48 in Texas, with four cases still active. Learn which animals are at risk, what symptoms to watch for and how officials are working to contain the spread.

The Texas agriculture commissioner supports the move by the federal agency.

The spray can be used for prevention but not for treatment of wounds affected by the New World screwworm.

The Canadian Food Inspection Agency is barring horses, pigs, cattle and other animals from Texas due to concerns over New World screwworm, a parasitic fly.

The New World screwworm is back in Texas. The lone star tick is on a tea. And the air is thick with blood-sucking mosquitoes. These are all parasites, and they are aggressively on the hunt for their next victim. We share the planet with these creatures, and we need to understand them to protect ourselves. Are they the villains of the animal kingdom or are they misunderstood?

Mexico’s cattle industry is facing a convergence of drought, disease and disrupted trade that has cut northern Mexican ranchers off from the U.S. market that shaped them for more than a century.

Texas Biomed plans on partnering with Flyttr, formerly known as Oxitec, a private biotech company based in England that specializes in pest management.

As of Thursday, Texas has confirmed 19 cases of New World screwworm, a flesh-eating parasite that could cause nearly $2 billion in annual economic losses. Wildlife experts warn that deer may be especially vulnerable because there is no proven way to treat them in the wild.

Several drugs to treat animals during the Texas screwworm outbreak have been approved by the Food and Drug Administration, including a generic medication for household pets such as dogs and cats.

The New World screwworm has crossed into Texas from Mexico, threatening livestock, wildlife and pets. Human infections are rare, but officials warn the parasite's spread poses a growing challenge for communities across South Texas.