Insights into Virulence and Pathogenesis of Staphylococcus aureus and Mycobacterium tuberculosis: A Comprehensive Review

Abstract

Bacterial pathogens employ diverse virulence factors to establish infection, evade host defences and promote disease progression. This review examines the virulence strategies of two clinically significant human pathogens, Staphylococcus aureus and Mycobacterium tuberculosis, which represent contrasting paradigms of bacterial infection. S. aureus utilizes an extensive repertoire of adhesins, exotoxins, immune evasion molecules and biofilm-forming mechanisms to induce rapid tissue destruction and systemic disease. In contrast, M. tuberculosis relies on complex cell wall components, intracellular survival mechanisms, immune modulation and dormancy associated pathways to establish persistent infection. Key virulence determinants include Microbial Surface Components Recognizing Adhesive Matrix Molecules (MSCRAMMs), protein A, α-toxins, quorum sensing systems, mycolic acids, lipoarabinomannan, ESX secretion systems and the DosR regulon. A comparative analysis highlights fundamental differences in acute and chronic infection strategies adopted by these pathogens. Understanding these distinct virulence strategies may facilitate the development of novel anti-virulence therapies and host-directed interventions, particularly in the context of rising antimicrobial-resistant pathogens.