Bovine Rabies Outbreak: Vaccination Campaign in San Luis Potosí, Mexico

Rioverde, San Luis Potosí, Mexico – February 13, 2026 – A case of bovine paralytic rabies has triggered a public health response in the municipality of Rioverde, San Luis Potosí. Agricultural authorities have initiated a containment operation to prevent further spread of the virus within the region’s livestock population.

The confirmed case was identified in the Progreso ejido, prompting the immediate implementation of a sanitary fence and the launch of an extraordinary vaccination campaign targeting cattle and other susceptible species. Initial efforts focus on administering thousands of vaccine doses to animals in communities surrounding the identified outbreak location.

The Secretariat of Agricultural Development and Hydraulic Resources of San Luis Potosí is collaborating with the State Committee for the Promotion and Protection of Livestock and local livestock organizations to expand immunization efforts to the municipalities of Villa Juárez and Guadalcázar. This coordinated response aims to proactively prevent additional cases.

Understanding Bovine Paralytic Rabies

Bovine paralytic rabies is a viral disease affecting the central nervous system of warm-blooded animals. The disease is particularly concerning in rural areas, where infection typically occurs through the bite of vampire bats – the primary vectors of the rabies virus in livestock. The virus causes a range of neurological symptoms, including behavioral changes, difficulty with movement, and progressive paralysis, ultimately leading to the animal’s death.

This form of rabies differs from the more commonly recognized “furious” rabies seen in other animals, including humans. While both are caused by the rabies virus, paralytic rabies, as the name suggests, primarily manifests with paralysis rather than the aggressive behavior often associated with the furious form. This can sometimes make early diagnosis more challenging.

A Long-Standing Challenge in Latin America

Rabies transmission via vampire bats has been a significant issue in tropical America for centuries, predating the arrival of Europeans. Historical accounts, such as those documented by Fernandez de Oviedo during the Darien conquest, detail instances of soldiers succumbing to bat bites. Similarly, Molina Solis’s account of Francesco de Montejo’s army in Yucatán notes attacks on both soldiers and horses by vampire bats.

The arrival of domestic mammals altered the feeding habits of vampire bats, leading them to preferentially target livestock, particularly cattle. This shift transformed vampire-transmitted rabies into a major impediment to livestock development across much of Latin America and the Caribbean.

Mexico’s Ongoing Control Efforts

Recognizing the economic and public health impact of bovine paralytic rabies, Mexico initiated a national program in 1968 to develop and implement effective control technologies. This program, a collaborative effort involving the National Institute for Livestock Research, FAO, and the United States Fish and Wildlife Office, received funding from the Mexican Government, the United Nations Development Programme (UNDP), and the United States Agency for International Development (USAID).

More recently, the SENASICA (National Service of Agrifood Health, Safety and Quality) has been actively operating a National Campaign to Prevent and Control Rabies in Bovines and Livestock Species across 26 states. This campaign encompasses epidemiological surveillance, diagnostic testing, rabies vaccination programs, and training for technicians and producers. According to recent data, from January to June 2020, veterinarians administered 871,000 rabies vaccines in response to outbreaks.

Progress has been made, with over half of Mexico’s national territory now considered free of bovine paralytic rabies. However, the recent case in San Luis Potosí underscores the need for continued vigilance and proactive control measures.

Public Health Implications and Prevention

While bovine paralytic rabies primarily affects livestock, it poses a potential risk to human health. Although rare, humans can contract rabies through the bite or scratch of an infected animal, including bats. Public health officials in areas where rabies is present in animal populations strongly recommend rabies vaccinations for both pets and livestock.

In San Luis Potosí, the current outbreak highlights the importance of adhering to established prevention strategies, including vaccination, monitoring livestock for signs of illness, and reporting any suspected cases to veterinary authorities. Controlling vampire bat populations is also a key component of long-term rabies prevention efforts, as demonstrated by successful campaigns in Brazil, Colombia, and Mexico.

The ongoing efforts in San Luis Potosí represent a critical step in protecting both animal and human health, and demonstrate the continued commitment to rabies control in Mexico.