Corynebacterium JK (Johnson-Kay strain) infection of a Küntscher-nailed tibial fracture.

A slow-growing Corynebacterium was isolated in pure culture from pus of a Küntscher-nailed tibial fracture. The strain was identified as Johnson-Kay strain or corynebacterium JK (CJK). This bacterium has been discovered recently and recognized as the cause of serious infections, especially in immunocompromized patients, polytraumatized patients, and patients with cardiac valve replacement. Superficial wounds can be colonized and hemocultures contaminated with CJK. Nosocomial spreading can occur. This microorganism is usually highly resistant to antimicrobial agents and requires therapy with vancomycin. This case was different from classic infections with "CJK" in several aspects. The infection occurred in a patient without underlying disease and the strain was sensitive to the antibiotic. The patient responded well to cephazolin treatment. Being part of the normal skin flora, Corynebacteria are often discarded as contaminants. A critical review of all clinical and laboratory data is necessary for the recognition of the infections and is important especially when a resistant strain is encountered.