Arcanobacterium haemolyticum, formerly known as Corynebacterium hæmolyticum, is a species of bacteria classified as a gram-positive bacillus. It is catalase-negative, aerobic, beta-hemolytic, and not motile.[1] It is part of the normal flora of the pharynx, but it may sometimes cause head and neck infections, pharyngitis, and sinusitis[1] (Arcanobacterium haemolyticum infections).