FIG. 3.

Internalization of noncapsulated variants of Klebsiella into HCT-8 cells. Relative invasion represents the percent increase in invasion of three noncapsulated variants (open boxes) from each of the indicated Klebsiella serotypes compared to the corresponding capsulated parent strains (=100%; closed boxes). The hatched box is the relative invasion of the K21a capsulated revertant strain derived from a noncapsulated variant strain. Percents invasion of the capsulated parent strains were 0.75, 2.94, 4.55, 3.58, and 2.74 for K26, K36, K50, K2, and K21a, respectively. All values for the noncapsulated variants are significantly higher (P < 0.01) than those for the corresponding capsulated parent strains. Data shown represent mean values and standard deviations.