A specimen on a 3-year-old girl is received from apediatrician’s office labeled “leg wound drainage.” At 48 hours,small grayish nonhemolytic colonies are observed on blood andchocolate agars. The colonies Gram stain as gram-negative bacilli,there is no growth on MacConkey agar. A distinct “musty” odor isdetected, and the colonies demonstrate a positive oxidaseresult.
Question:
The suspected organism can be screened for based on sensitivityto a common antibiotic. What is the screening procedure oftenused?
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