Coahuila: Sanitary Fence Activated After Fatal Tick Bites in Ramos Arizpe

Health officials in Coahuila, Mexico, are investigating a potential outbreak of Rocky Mountain spotted fever (RMSF) following the deaths of two brothers in Ramos Arizpe. The incident, reported on February 7, 2026, has prompted a public health response, including the activation of a sanitary fence in the affected area.

What is Rocky Mountain Spotted Fever?

Rocky Mountain spotted fever is a tick-borne bacterial disease caused by Rickettsia rickettsii. It’s spread to humans through the bite of infected ticks, including the American dog tick, brown dog tick, and Rocky Mountain wood tick. While the name suggests a limited geographic range, RMSF has been reported in several states in the United States and, increasingly, in parts of Mexico. The disease is not spread from person to person.

Recent Cases in Mexico

The northern region of Mexico, particularly states bordering the United States – Baja California, Sonora, Chihuahua, Coahuila, and Nuevo León – has seen an increase in reported cases of RMSF. According to recent data, as of this year, there have been 37 reported cases of rickettsiosis (which includes RMSF) in Coahuila, resulting in 7 deaths. The deaths of the two brothers in Ramos Arizpe represent two of those recent fatalities, occurring within the past week. Cases have also been reported in Saltillo, La Fuente, Acuña, San Pedro de las Colonias, Múzquiz and Francisco I Madero.

Symptoms and Diagnosis

RMSF can be a severe and potentially fatal illness if not diagnosed and treated promptly. Symptoms typically appear within two weeks of a tick bite and can include fever, headache, nausea, vomiting, abdominal pain, muscle aches, and a characteristic rash. The rash often begins on the wrists and ankles and spreads to the trunk, palms, and soles of the feet. Swelling around the eyes or on the back of the hands can also occur.

Diagnosis can be challenging as early symptoms are often non-specific and can mimic other illnesses. Health authorities in Coahuila are working to confirm or rule out RMSF as the cause of death in the two brothers, with test results expected within 48 hours of sample collection.

Public Health Response

Following the deaths of the brothers, the Coahuila Secretary of Health has initiated a series of public health measures. These include epidemiological surveillance in the Manantiales del Valle colony of Ramos Arizpe, where the brothers lived. Health personnel are conducting home visits, interviewing family members, and inspecting the surrounding environment to identify potential risk factors and prevent further spread. Preventive fumigation is also underway.

Prevention Strategies

Protecting against RMSF involves minimizing exposure to ticks and taking precautions when in tick-prone areas. The CDC recommends the following preventative measures:

• Use insect repellent: Apply EPA-registered insect repellent containing DEET to exposed skin and clothing.
• Check for ticks: Thoroughly check your body, your children’s bodies, and clothing for ticks daily after spending time outdoors.
• Remove ticks promptly: If you find a tick, remove it as soon as possible.
• Protect pets: Ticks often live on dogs and can be brought into homes. Use tick preventatives on pets and consult with a veterinarian for guidance.

It’s important to note that ticks can be very small and their bites may be painless, making detection difficult.

Treatment and Importance of Early Intervention

RMSF is treatable with antibiotics, particularly doxycycline. However, early diagnosis and treatment are crucial for preventing severe complications and death. Individuals who have traveled to northern Mexico and develop symptoms such as fever, headache, or rash within two weeks of their return should seek immediate medical attention.

The recent cases in Coahuila underscore the importance of awareness and vigilance regarding tick-borne diseases, particularly in regions where RMSF is prevalent. Public health officials continue to monitor the situation and implement measures to protect the community.

In Ramos Arizpe, a separate case of whooping cough (pertussis) has also been confirmed in a young girl who recently moved to the Santos Saucedo colony, leading to the installation of another sanitary fence by health authorities.