CDC Confirms Rare Flesh-Eating Parasite Case

The Centers for Disease Control and Prevention (CDC) has confirmed the first U.S. human case of the New World screwworm parasite (Cochliomyia hominivorax) in decades. The patient, a Maryland resident, contracted the infection after traveling to El Salvador, where outbreaks have been reported.

What Is the New World Screwworm?

The screwworm fly lays eggs in wounds or natural openings, and its larvae feed on living tissue, causing painful infections. While rare in humans, the parasite is devastating to livestock, potentially costing billions of dollars in cattle losses if reintroduced into the U.S.

Government Response

U.S. authorities have implemented containment measures including expanded sterile fly programs in Texas, tighter cattle import restrictions, and increased surveillance. The USDA confirmed that no animal cases have been detected so far, minimizing immediate risk.

Why This Case Matters

• First case since 1960s eradication – highlighting global travel risks.
• Economic threat: Texas alone could face $1.8B in cattle losses.
• Global concern: Central America still sees active screwworm infestations.
• Low but serious risk: Rare in humans, but highly dangerous without treatment.