An Unusual Presentation From a Sporadic Partially Acid-Fast Aerobic Actinomycete Resistant to Common Antibiotics.

Nocardia causes rare opportunistic infections, that can be challenging to diagnose because of atypical features on conventional microbiological identification techniques. Immunosuppressed patients are more susceptible to infections from Nocardia and are associated with multi-organ involvement. We report a case of a 63-year-old male who developed peritonitis from Nocardia farcinica that rarely causes infections in humans. The nonspecific symptoms, negative blood cultures, and slow growth can make diagnosis difficult. Despite aggressive therapy, the virulence and inherent resistance to the antibiotics can result in high mortality from Nocardia farcinica infections.