arcanobacterium haemolyticum infection arcanobacterium haemolyticum infection an arcanobacterium haemolyticum infection is any of several types of infection with the gram-positive bacillus arcanobacterium haemolyticum. it can cause an acute pharyngitis, and it may cause an exanthem characterized by an erythematous, morbilliform or scarlatiniform eruption involving the trunk and extremities.: 268 arcanobacterium haemolyticum infectionspecialtydermatology