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SLO Streptolysin O C4BP C4b-Binding Protein CAMP Factor Christie, Atkins and Munch-Petersen CbpA Choline-Binding Protein A CBPs Choline Binding Proteins CDCs Cholesterol-Dependent Cytolysins CW Cell Wall-anchored DNAases Deoxyribonucleases FBP54 Fibronectin-Binding Protein 54 FBPs Fibronectin Binding Proteins FbsB Fg-Binding surface protein B FCT fibronectinand collagen-binding T-antigen FHL-1 Factor H-like protein GAG Glycosaminoglycan GAS Group A streptococcus GBS Group B streptococcus GRAB protein G-related α2M-binding protein GRAB G-related α2macroglobulin-binding protein H2O2 Hydrogen peroxide HA hyaluronic acid HylA Hyaluronatelyase Abstract: Streptococcus species possesses a wide variety of virulence factors and can cause severe invasive infections. Accordingly, the field of bacterial pathogenesis has rapidly expanded with a greater understanding of pathogenesis at the molecular level over the last decades. The ability of bacteria to cause disease is described in terms of the number of infecting bacteria, the route of entry into the body, the effects of host defense mechanisms, and intrinsic characteristics of the bacteria called virulence factors. One essential prokaryotic cell function is the transport of proteins from the cytoplasm into other compartments of the cell, the environment, and/or other bacteria or eukaryotic cells a process known as protein secretion.Secreted proteins can play many roles in promoting bacterial virulence, from enhancing attachment to eukaryotic cells, to scavenging resources in an environmental niche, to directly intoxicating target cells and disrupting their functions. Virulence factors encoded on pathogenic islands represent the entire spectrum of bacterial virulence factors, from adhesins ,toxins, secretion systems, invasins, modulins, effectors, proteases, lipases, and enterotoxins, superantigens, iron uptake systems, immunoglobulin A proteases, capsule synthesis, host defense avoidance mechanisms.

Review on Major Virulence Factors of Pathogenic Streptococcus Species