Case Presentation: A 24-year-old female with a history of IV drug abuse and MRSA tricuspid native valve endocarditis was treated for lobar pneumonia 4 months prior to readmission for non-bloody cough and pleuritic chest pain. Recurrence of lobar pneumonia was suspected but workup instead revealed Mycobacterium abscessus bacteremia. She denies any fevers, chills, nausea, vomiting, [...]