29th July 2023

A 45-year-old welder presents to A&E with a large paronychia on his left index finger

A 45-year-old welder presents to A&E with a large paronychia on his left index finger, which is subsequently surgically debrided under anaesthetic, with pus samples sent for analysis. Microscopy shows a Gram positive cocci in clumps, for which catalase and coagulase tests are positive.

What is the causative organism?

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