TABLE 1.

HS mutant classes and their phenotypes

Strain or class% Motility ina:Colony morphologyDoubling timeb (%)HemagglutinationNo. of HS mutants isolated (frequency of occurrence [%])Representative strains
0.4% agar0.7% agarLiquid
ES114 (parent)[100][100][100]Smooth[100]+NAcNA
Class I117177144Smooth100+119 (95.2)DM66, DM69
Class II115140149Mucoid80+3 (2.4)DM73, DM74
Class III110164151Mucoid1003 (2.4)DM61, DM70
  • a The “100%” value (in brackets) is equivalent to 4.5 mm h−1 (in 0.4% agar) and 0.18 mm h−1 (in 0.7% agar).

  • b The “100%” value (in brackets) is equivalent to 42 min.

  • c NA, not applicable.