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Initial isolation of M. radiotolerans from the blood culture of a 23-year-old patient (case 4). The plates, upon spread of lysed blood sediment from the Isolator tube, were incubated for 5 days with 5% carbon dioxide. Numerous colonies grew on buffered charcoal yeast extract agar (top right), fewer and smaller colonies on the chocolate agar (top left and lower right), and none on blood agar (lower left).
