Invasive screwworm prompts warning from Texas wildlife officials

HOUSTON, Texas -- It probably won't take much to convince Texans to stay away from the latest invasive species from Mexico, once they hear about the symptoms. Texas Parks and Wildlife Department (TPWD) says to look out for evidence of the New World Screwworm (NWS) affecting animals, especially near the state's southern border.

So far it sounds like the NWS is still relatively far away, having been spotted in a cow at a checkpoint near the border between Mexico and Guatemala. It was eradicated from the United States in 1966, according to TPWD, but it is being tracked northward from South and Central America.

Although it's called a worm, it is really a parasitic larva, and this is where things get disturbing.

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