Table 1

Distribution of genes encoding pilus islands across serotypes

SerotypeNo. of isolates by PIaTotal no. of isolates
PI-1 and PI-2aPI-1 and PI-2bPI-2aPI-2b
Ia1142112228
Ib5103054
II104080112
III10216840274
IV1150117
V1193211144
VI00101
VII10203
NTb39619165
Total4381862695898
  • a The PI combination including more than half of the isolates in serotypes including more than 10 isolates are indicated in bold.

  • b NT, nontypeable.