(formerly known as ) is the causative agent of sore throat and also causes skin and soft tissue infections in diabetes patients. is a Gram-positive, catalase-negative, β-haemolytic bacillus. poses a diagnostic challenge in the hospital laboratory because most coryneform bacilli are considered as normal flora or contaminants, and it is therefore difficult to differentiate from β-haemolytic streptococci by colony characteristics.

Case presentation:

was isolated from a diabetic patient with foot ulcers and the isolate was identified by using a VITEK-2 system, CAMP inhibition test, reverse CAMP test and a 23S rRNA gene sequence analysis. The isolated inhibited haemolysis of in the CAMP test and enhanced haemolysis of in the reverse CAMP test. The diabetic patient was treated with teicoplanin and imipenem, and the ulcers healed within 2 weeks.


The present study suggests that a haemolytic differential method using the CAMP inhibition and reverse CAMP tests can be useful for differentiating from β-haemolytic streptococci.


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