OSTEOMYELITIS OF THE HUMERUS CAUSED BY PROPIONIBACTERIUM ACNES.

Propionibacterium acnes is a fastidious slow-growing anaerobic gram-positive bacillus best known for causing acne. However, it only occasionally has been isolated from invasive infections. In that setting, slow growth and low virulence may lead to indolent presentations and diagnostic delays as illustrated by the following case.