Two Decades of Human Rabies in Brazil: Epidemiological Trends, Emerging Risks and Treatment Challenges.

Abstract

Background: Rabies poses a serious public health challenge in Brazil, and its epidemiology has undergone significant changes over the past two decades. Although canine transmission of rabies has been controlled through national vaccination programs, new risks have emerged, particularly from wildlife reservoirs.

Methods: We performed a retrospective analysis of human rabies cases reported in Brazil between 2001 and 2025 using epidemiological surveillance data, scientific literature, and public health reports. We focused on trends in transmission sources, changes in affected populations, and challenges in prevention and treatment, particularly regarding the availability of post-exposure prophylaxis (PEP).

Results: A total of 188 human rabies cases were reported in Brazil between 2001 and 2025 (average: 7.52 cases per year). Most of the cases occurred in the northern and northeastern regions of the country. Bats were the most common source of transmission, followed by dogs and non-human primates. Although rabies is preventable, most of the cases reported within the study period resulted in death. PEP was administered in most cases; however, the treatment may have been delayed, incomplete, or initiated after the onset of symptoms, which limited its effectiveness. Only two patients survived, and both of them received intensive care and were treated using modified therapeutic protocols.

Conclusion: The transition from canine- to bat-mediated rabies highlights the need for enhanced surveillance and targeted prevention strategies. Despite advances in canine rabies control, ensuring PEP accessibility and strengthening public health interventions in high-risk areas remain critical for reducing the incidence of human rabies in Brazil.