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Ultrathin sections of ferritin-labeled V. cholerae O139 strains isolated in 2002, (A) CIRS 134, (B) CIRS 121, and (C) CIRS 124 and a strain isolated in 1993, (D) VC 088. Ferritin particles are visible in different densities around the cell periphery, indicating the presence of capsule. Various amounts of particles are visible in the different strains. CIRS 134 has the least amount of capsular material.
