Table 1.

Cross-reaction among S. flexneri serotypes

Vaccine/ O antigenCross-reaction withS. flexneri serotype:
1a1b2a2b3a3b3c4a4b4c5a5b6XY
S. flexneri 2a CVD 1207
 Type factor II++
 Group factors 3,4++++++
S. flexneri 3a CVD 1211
 Type factor III+++
 Group factor 6+++++
 Group factors 7,8+++++