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SUMMARY: A description is given of a selective medium which supports the growth of Haemophilus pertussis and Haemophilus parapertussis and largely inhibits the growth of Haemophilus influenzae. The medium contains horse-meat extract, horse blood, salt agar, 2 μg. 4:4′-diamidino-diphenylamine-dihydrochloride/ml. and 0·3 unit penicillin/nil. The medium is of value in the primary isolation of H. pertussis and H. parapertussis.
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