Capsular serotyping of C. canimorsus isolates from human infections. Western blot analysis of proteinase K-treated lysates of C. canimorsus human isolates using the following sera: Y1C12-adsorbed anti-Cc5 (A), anti-Cc6 (B), anti-Cc9 (C), anti-Cc12 (D), and anti-Cc4 (E). Noncapsulated Cc5 Y1C12, Cc6 ΔwbuB, Cc9 ΔwbuB, and Cc12 ΔwbtA mutants were used as controls in panels A, B, C, and D, respectively. Numbers correspond to molecular weight markers in thousands.