Table 2.

Characteristics of 85 N. meningitidis strains used for bactericidal assays

Hypervirulent clustersYear of isolationTotal
Before 19801980–19951996–2002
ST32 cpx (ET5)14611
ST41/44 cpx (lineage 3)051621
ST8 cpx (A4)1247
ST11 cpx (ET37)241117
Others* 381829
Total7235585
  • *The strains that do not belong to any of the hypervirulent clusters have been classified as others.