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A simple blood-tellurite medium has been described which is absolutely selective for C. diphtheriae and the diphtheroids. In many cases diagnosis at sight of the colonies is possible after 24 hours' incubation. The medium is especially useful for the isolation of carriers when diphtheria bacilli are present in very scanty numbers. 2. The existence of two main types of C. diphtheriae has been confirmed.
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Horgan et al. (1932) studied this question.
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