MSRA-1301

A typically healthy 44-year-old man is hospitalized with T11/12 discitis that is complicated by a T4 to L1 epidural abscess and a left psoas abscess. Following surgery to drain the abscesses, laboratory cultures reveal the presence of Staphylococcus aureus. Furthermore, blood cultures taken upon admission grow Staphylococcus aureus after 72 hours. What is the most suitable initial investigation to identify the source of the infection, given the pathogenic organism detected?