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The study of the electronograms of B. pertussis strains isolated in the foci of pertussis revealed the existence of the morphological variants of these cells, differing in the character of the cell wall, the state of the cytoplasm, the presence of amorphous inclusions of medium electron-optical density. The morphological variants did not correlate with the character of B. pertussis colonies isolated from blood-charcoal agar. The ultrastructure of the cells belonging to the second morphological variant was similar to that of the cells from the museum strain, altered by tetracycline treatment in the course of the experiment.
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