For a genuine fright this Halloween, you can turn your gaze to the southern border, where ravenous, flesh-eating maggots are festering and have taken to eating people's pets.

This week, the country's New World Screwworm (NWS) infestation spread to a third state, Arizona, which joins New Mexico and Texas in being plagued by the horrifying parasites. To date, 74 animal cases have been identified in the US since the flies re-invaded the country in June.

The flies lay hundreds of eggs in wounds and moist orifices of animals, and the resulting voracious maggots feast on their victims. The maggots resemble screws and tortuously bore and twist into living flesh, causing severe, sometimes fatal wounds, before dropping to the ground to develop into adults.

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About a fifth of the 300,000 metric tons of lean beef trimmings have come through customs, six weeks through a program designed to lower prices.

© Dado Galdieri for The New York Times