抄録
1. Pertussis antitoxic factor serum containing no agglutinin was prepared by absorbing it with pertussis phase I bacteria which had been heated at 56ª C for 1 hour.
2. When absorbed antitoxic serum was further fractionated by zone electrophoresis, antitoxin was obtained as γ-globulin.
3. Antitoxin was electrophoretically homogeneous, free of agglutinin and contained an antitoxic titer corresponding to that of unabsorbed serum.
4. Antitoxin was ineffective in the intracerebral protection test in mice.
