FURTHER STUDIES ON VARIANTS OF HAEMOPHILUS PERTUSSIS; ELECTRONMICROSGOPIC OBSERVATIONS AND THE PROPERTY OF HISTAMINE SENSITIZATION OF MICE

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1. H. pertussis Tohama variant as well as strain No. 29 demonstrate positive capsule staining similar to that of Phase I strain, while Phase III strain does nottake the stain.
2. Electronmicroscopic studies show no significant differences of structure among these strains of H pertussis.
3. All these variants and the Phase I strain produce sensitization to histamine in mice.