Virulence factors for meningococci

Meningococci are capsulated, unlike Neisseria. Based on their capsular polysaccharide antigens, they are classified into 13 subgroups, of which groups A, B, C, X, Y and W-135 are the most impoant Reference: Textbook of Microbiology; Anathanarayan and panicker's; 10th edition; Page no: 231