Virulence factor | Main components | Major function(s) |
Capsule (77 K serotypes) | K1 or K2 capsular polysaccharide | Antiphagocytosis |
Hypermucoviscosity phenotype | Extracapsular polysaccharide | Serum resistance |
Lipopolysaccharide (O-antigen 9 serotypes: O1, O2, O2ac, O3, O4, O5, O7, O8, and O12) | Lipopolysaccharide | Endotoxin |
O side chain | Serum resistance | |
Siderophores | Enterobactin, aerobactin, aerobactin receptor, kfu iron uptake system | Enhanced growth |
Pili (fimbriae) | Adhesin | Attachment |
Type 1 pili (FimH adhesion) | Mannose-sensitive | |
Type 3 pili (MrkD adhesion) | Mannose-resistant |
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