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During coughing, however, the danger zone is immensely widened. We were surprised at the distance we could project the organisms during a hard spell of coughing. At first we exposed plates only to a distance of 6 feet. Subsequently we exposed plates up to a distance of 10 feet, on which we recovered B. prodigiosus in sufficient numbers to suggest the possibility of even greater projection. We found that the chances of recovering B. prodigiosus from the more distant plates were increased if the observer renewed the organisms in his mouth during the period of coughing. From our work it would seem that the danger zone about a coughing patient has at least a 10-foot radius.

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