Since 2006, the U.S. Animal and Plant Health Inspection Service (APHIS) has been collaborating with Panama to establish a barrier zone to prevent the northward spread of New World Screwworms (NWS) in Central and North America.
However, in the past two years, the screwworm has spread beyond the barrier, affecting eastern Panama and reaching Costa Rica, Nicaragua, Honduras, and Guatemala.
And in mid-2025, NWS reached central Mexico.
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