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. 2000 Dec;68(12):6744–6749. doi: 10.1128/iai.68.12.6744-6749.2000

TABLE 1.

MSHA and MR/K-HA by capsulated strains, noncapsulated variants, and capsule-switched derivative strainsa

Strain Minimal no. of bacteria (CFU/ml) causing:
MSHA MR/K-HA
K21a 1.5 × 109 3.0 × 109
K21a/3 (CPS−) 2.25 × 106 3.0 × 109
KPTA 46 (CPS−) 3.5 × 107 3.0 × 109
KPTA 47 (CPS−) 2.25 × 106 3.0 × 109
KPTA 55 (CPS+, revertant) 1.5 × 109 3.0 × 109
K26 3.0 × 109 7.5 × 108
K26/1 (CPS−) 3.0 × 109 4.0 × 108
KPTA 50 (CPS−) 3.0 × 109 7.5 × 108
KPTA 51 (CPS−) 3.0 × 109 7.0 × 107
K36 1.5 × 109 1.5 × 109
K36/3 (CPS−) 1.5 × 109 4.0 × 108
KPTA 40 (CPS−) 1.5 × 109 4.0 × 108
KPTA 41 (CPS−) 1.5 × 109 3.0 × 109
K50 4.0 × 108 7.5 × 108
K50/3 (CPS−) 2.25 × 106 4.0 × 108
KPTA43 (CPS−) 9.0 × 106 4.0 × 108
KPTA 44 (CPS−) 2.25 × 106 7.0 × 108
K2 3.0 × 109 3.0 × 109
KPTA 38 (CPS−) 3.0 × 109 3.0 × 109
KPTA 52 (CPS−) 3.0 × 109 3.0 × 109
KPTA 53 (CPS−) 3.0 × 109 3.0 × 109
K2(K36) 3.0 × 109 3.0 × 109
a

MSHA and MR/K-HA activities were determined using bacteria harvested after 48 h of growth (after four passages) in BHI (for MSHA) or in nutrient broth (for MR/K-HA) or using bacteria harvested after 2 h of growth in LB inoculated with passage 4 bacteria. Values for 48- and 2-h incubations were the same. CPS−, noncapsulated variant.