Mexican health authorities issued a preventive alert after the New World screwworm was detected in Zapopan, Jalisco.
The parasite poses a significant risk to public health and livestock because the larvae consume living tissue, potentially leading to severe infections or death if left untreated.
The Secretaría de Agricultura y Desarrollo Rural (SADER) and the Agencia de Sanidad, Inocuidad y Calidad Agroalimentaria (ASICA) issued the warning [1]. The New World screwworm is a fly that lays eggs in open wounds. Once the eggs hatch, the larvae begin to devour live tissue within 24 hours [2].
Officials said that heavy rains have accelerated the reproduction of the screwworm fly, which has increased the risk of infestation for any animal or person with a skin break [2]. The parasite is particularly dangerous for pets and livestock, though it can affect humans through open cuts, or surgical sites.
According to reported data, there have been 352 infected individuals in Mexico [2]. This surge in cases has prompted local authorities in the Jalisco region to urge residents to monitor their pets and themselves for any signs of infestation.
Authorities said that immediate medical or veterinary attention is required if larvae are spotted in a wound. The rapid nature of the tissue consumption makes early detection critical for survival and recovery [2].
“The larvae begin to devour live tissue within 24 hours.”
The emergence of the New World screwworm in Jalisco represents a significant veterinary and public health challenge. Because the parasite targets living tissue rather than necrotic flesh, it can cause rapid systemic deterioration. The correlation between heavy rainfall and increased fly populations suggests that climate-driven environmental changes may expand the geographic reach of the pest, necessitating stricter biological surveillance and wound-care protocols across Mexico.
