The Streptococcus suis hemolysin gene (SLY) encodes a cytolytic toxin known as suilysin, considered one of the primary virulence factors of this pathogen. Streptococcus suis is a Gram-positive bacterium of great importance in swine production, associated with conditions such as septicemia, meningitis, arthritis, pneumonia, and endocarditis, in addition to representing a relevant zoonotic agent.
Suilysin is a toxin belonging to the cholesterol-dependent cytolysin family, capable of forming pores in host cell membranes. This activity causes cell lysis and tissue damage, and contributes to the evasion of the immune system, favoring bacterial dissemination throughout the host’s organism.
The presence of the SLY gene is frequently associated with Streptococcus suis strains of higher pathogenic potential. Studies indicate that isolates positive for this gene exhibit greater invasive capacity and increased clinical severity, especially in systemic infections. Thus, the SLY gene is widely used as a molecular virulence marker in epidemiological studies.
The transmission of Streptococcus suis occurs mainly through direct contact between animals, especially in high-density environments such as commercial farms. Factors such as stress, inadequate management, co-infections, and biosecurity failures favor the clinical expression of the disease.
The economic impacts associated with Streptococcus suis infections are significant and include increased mortality, production losses, costs for antimicrobial treatments, and animal culling. Furthermore, the zoonotic risk of the agent reinforces the importance of sanitary control and the protection of exposed workers.
Laboratory detection of the SLY gene is primarily performed using molecular methods, such as polymerase chain reaction (PCR), which allows for the rapid and specific identification of potentially more virulent strains. This approach is fundamental for diagnosis, epidemiological surveillance, and the implementation of more effective control measures.
Epidemiological surveillance based on the identification of virulence genes, such as SLY, combined with good biosecurity practices, proper sanitary management, and continuous livestock monitoring, is essential for reducing the incidence of Streptococcus suis infections. These strategies contribute to the improvement of herd health, the reduction of economic losses, and the strengthening of the swine production chain’s sustainability.
In this context, Bioperfectus’ rapid test for detecting the Streptococcus suis SLY gene represents a strategic screening tool to support sanitary surveillance in swine herds. The use of the rapid test enables the agile identification of strains carrying the SLY virulence gene directly within the monitoring routine, assisting in immediate decision-making, such as animal segregation, intensification of biosecurity measures, and the directing of samples for confirmation by molecular methods. In this way, the rapid test complements conventional laboratory techniques, contributing to the early detection of potentially more virulent strains, the reduction of clinical outbreaks, and the strengthening of Streptococcus suis control strategies, with a positive impact on both animal and public health.
