Ask Onix
Parasite resurfaces in US after six decades
The New World Screwworm, a parasitic fly that consumes living tissue, has been found in Texas for the first time since 1966, the US Department of Agriculture confirmed on Wednesday.
First case in decades
The larvae were discovered in a three-week-old calf near La Pryor, Texas, approximately 48 kilometers from the Mexican border. The infestation was located in the animal's umbilical area, according to USDA officials.
Spread and risks
The parasite has been moving northward through Mexico over the past year, prompting US authorities to implement preventive measures. Female screwworm flies lay eggs in open wounds or mucous membranes, and the resulting larvae feed on living flesh, potentially killing the host if untreated.
While the fly primarily targets livestock, it can also infest humans and pets, though human cases remain rare. The USDA emphasized that the parasite poses no risk to food safety.
Response and containment efforts
The USDA and Texas authorities have established a 20-kilometer quarantine and detection zone around the affected area. Plans are underway to release millions of sterile male screwworm flies, as females mate only once-unfertilized eggs will not hatch.
Agriculture Secretary Brooke Rollins stated that federal personnel are already on-site in South Texas to assist with containment. She urged livestock producers to remain vigilant.
Criticism of federal response
Texas Agriculture Commissioner Sid Miller criticized the USDA's approach, telling Reuters that the agency acted too slowly and relied on a partial solution that could take years to fully implement.
"Instead of using every available tool, USDA moved too slowly and relied solely on a partial solution that takes years to fully implement."
Sid Miller, Texas Agriculture Commissioner
Economic concerns
Cattle ranchers have warned that an outbreak could reduce herd sizes, disrupt beef production, and drive up consumer prices. The USDA noted that preventive efforts have already delayed the parasite's arrival by a year.
