Streptococcus suis infection as an emerging zoonotic threat in Brazil: a One Health-based review

Streptococcus suis infection is an emerging zoonotic pathogen of growing concern in Brazil, particularly in the Northeast-a region lacking swine-focused surveillance. Although human contamination remains rare, they have been increasingly reported among individuals exposed to pigs or pork products, and most commonly present as central nervous system infections. Diagnostic challenges persist, especially related to culture-based methods, highlighting the need for advanced molecular tools like polymerase chain reaction and metagenomic Next-Generation Sequencing. Veterinary data reveal a high diversity of serotypes and concerning rates of antimicrobial resistance. These studies remain scarce in regions with reports of human infection. This review highlights the clinical, epidemiological, and microbiological aspects of S. suis in Brazil and underscores the importance of One Health approaches to enhance detection and prevention.