抄録
Antigenic structure and phase variations of H. parapertussis are described. There exist three antigenic phases: Phase I has capsular thermolabile L antigen, capsular thermostable S antigen, and somatic thermostable O antigen; phase III1 and III2 lack capsular antigens. Phase III1 has the same O antigen 2 as phase I, while phase III2 lacks it. Phase III1 and III2 have a common O antigen 3. Variations are produced changing phase I to phase III1, and phase III1 to phase III2, Phase I is the pathogenic phase and has an hemagglutinin, high toxicity, and protective antigenicity.
