In Focus delivers deeper coverage of the political, cultural, and ideological issues shaping America. Published daily by senior writers and experts, these in-depth pieces go beyond the headlines to give readers the full picture. You can find our full list of In Focus pieces here.

The New World screwworm’s reappearance in the United States has officials scrambling to explain the parasite’s arrival, decades after it was declared eradicated from the country. 

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