Reuters has the article. The person carrying the screwworm had returned from a trip to El Salvador. The article notes:
Screwworms are parasitic flies whose females lay eggs in wounds on any warm-blooded animal. Once the eggs hatch, hundreds of screwworm larvae use their sharp mouths to burrow through living flesh, eventually killing their host if left untreated.
The maggots' feeding is similar to a screw being driven into wood, giving the pests their name.
Close the borders.
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