Can humans get New World screwworm? How do I protect myself?

Yes, humans can develop New World screwworm myiasis, but human cases are uncommon. Most infestations occur in animals. Human infections typically happen when a person has an untreated wound or spends time in an area where NWS flies are present.

The flies do not bite. Instead, females deposit eggs in open wounds or natural body openings. After hatching, the larvae burrow into living tissue and can cause pain, swelling, drainage, and tissue damage.

Texans may be at risk if they live in areas where the flies are present and they spend a lot of time outdoors during the day. The best protection is simple: keep wounds clean, covered, and properly treated. Seek medical attention for wounds that are slow to heal, appear infected, or show unusual drainage or movement. People who work closely with livestock, wildlife, or animals in affected areas should take extra care to inspect wounds regularly and practice good hygiene.

At this time, no locally acquired human cases have been reported in the current U.S. outbreak. However, public health officials recommend vigilance, particularly in areas where animal cases have been detected.

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