Figure 1: (a) Gram stained smear of the pus sample in case 1, showing branched gram positive bacilli (arrow), gram positive cocci and pus cells (×1000). (b) Case 1: Blood agar plate with beta haemolytic colonies of A. haemolyticum. Gram stained smear of the colonies (inset). (c) Case 1: Reverse CAMP test; A. haemolyticum is streaked vertically and S. aureus is streaked horizontally. Note the zone of inhibition of haemolysis near the streakline of A. haemolyticum