13th June 2024

A 19-year lady presents with a history of erythema and vesicles involving her left arm

A 19-year lady presents with a history of erythema and vesicles involving her left arm. Some vesicles have crusted, with a golden appearance. Her arm is warm and tender, and her body temperature has been found to be 38 degrees Celsius. She later developed acute glomerulonephritis. A skin swab showed gram positive cocci in chains. It was sub-cultured on blood agar. What would be seen on a blood agar plate in this case?

Select the SINGLE most appropriate option from the list below. Select ONE option only.