Biochemical Reactions To Distinguish Corynebacterium that may be Found in Upper Respiratory Tract in Humans - LabCE.com, Laboratory Continuing Education

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Biochemical Reactions To Distinguish Corynebacterium that may be Found in Upper Respiratory Tract in Humans

Table 5. Biochemical Reactions To Distinguish Corynebacterium that may be Found in Upper Respiratory Tract in Humans.

Organism Name	Metachromatic granules	Cellular morphology	Catalase	Pyrazinamidase	Gelatinase	Urease	Lactose	Maltose	Trehalose	Starch	Glucose
C. diphtheriae var. mitis	Pos	Slender, pleomorphic often club forms	Pos	Neg	Neg	Neg	Neg	Pos	Neg	Neg	Pos
C. diphtheriae var. gravis	Pos	Slender, pleomorphic often club forms	Pos	Neg	Neg	Neg	Neg	Pos	Neg	Pos* (*Note: This is a distinguishing feature between the three diphtheriaes)	Pos
C. diphtheriae var. intermedius	Pos	Slender, pleomorphic often club forms	Pos	Neg	Neg	Neg	Neg	Pos	Neg	Neg	Pos
C. ulcerans	Pos	Short rods and coccoid forms	Pos	Neg	Pos (rare negative may be found)	Pos (rare Negative may be found)	Neg	Pos	Pos (rare negative may be found)	Pos	Pos
C. pseudotuberculosis	Pos	Small, irregular rods	Pos	Neg	Neg	Pos	Neg	Pos	Neg	Neg	Pos
C. xerosis	Pos	Polar staining rods, few club forms	Pos	Pos	Neg	Neg	Neg	Neg (rare positive may be found)	Neg	Neg	Pos