The Secretaría de Salud has confirmed the first human case of myiasis caused by the screwworm (Cochliomyia hominivorax) in Mexico. This unusual case was reported on April 18, 2025, involving a 77-year-old woman residing in Acacoyagua, Chiapas. Currently, she is stable and receiving treatment at the Hospital de Alta Especialidad Ciudad Salud in Tapachula.
Myiasis, a parasitic infection, commonly affects livestock but can occasionally infest humans, raising significant health concerns. The larva of the bluish-green fly, which measures between 10 and 15 millimeters, typically enters the body through open wounds or natural cavities such as the nostrils, mouth, and ears. The Secretaría de Salud has activated health protocols in response to this incident, emphasizing the importance of public health vigilance.
The patient's condition is stable, and she is undergoing antibiotic treatment. Health authorities have reported that immediate actions were taken following the confirmation of this case, and so far, no additional human cases have been identified. Symptoms of myiasis include intense pain, itching, and in severe instances, the potential for ulcers, especially if the larvae invade sensitive areas like the nostrils, leading to the destruction of cartilage and tissue.
"This case has raised alarms within the health sector, as myiasis is more common in animals, but its occurrence in humans is rare and poses risks to public health and the agricultural sector," noted a spokesperson from the Secretaría de Salud.
In response to the confirmed case, Mexican authorities, in collaboration with the Servicio Nacional de Sanidad, Inocuidad y Calidad Agroalimentaria (SENASICA), have initiated extensive training on epidemiological surveillance, prevention, and control measures. The epidemiological brigade in Tapachula is actively promoting health awareness and conducting surveillance in the local area where the woman resides.
Historically, the screwworm was declared eradicated in Mexico in 1991; however, a resurgence was noted in late 2024 when an outbreak occurred in Catazajá, Chiapas. This prompted the United States to temporarily halt the importation of Mexican cattle due to concerns over the pest. The current case has reignited fears of a potential outbreak, particularly in rural areas with limited access to healthcare.
Health experts are urging the public to maintain strict hygiene practices, cover wounds adequately, and avoid contact with animals that may be infested. The reappearance of the screwworm emphasizes the need for ongoing monitoring and preventive measures to protect both human and animal health.
As part of the response strategy, health authorities are also educating farmers and livestock producers about the importance of regular inspections of their animals. This proactive approach aims to prevent further cases of myiasis and minimize the economic impact on the livestock industry, which could face significant losses due to decreased productivity and trade restrictions.
The Secretaría de Agricultura has also begun disseminating information regarding the risks associated with the screwworm and the necessary precautions to take. Coordinated efforts between health and agricultural authorities are crucial in addressing this emerging threat.
In summary, the confirmation of the first human case of myiasis in Mexico serves as a stark reminder of the potential risks posed by zoonotic diseases. As health officials continue to monitor the situation closely, the cooperation between various sectors is essential in safeguarding public health and ensuring the welfare of livestock.
