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Isolated abdominal nocardiosis in a pediatric renal transplant recipient.

Nocardia infection after RT is uncommon. The most common modes of exposure are inhalation of dust containing nocardia or contaminated soil/water and surgical instruments. Isolated abdominal nocardiosis following RT has not been reported. We report an 11-year-old female who developed nocardia abscesses of the abdomen post-RT. ESRD was secondary to FSGS and she had received multiple immunosuppressive agents prior to transplant. Induction immunosuppression consisted of thymoglobulin and maintenance was with tacrolimus, mycophenolate, and prednisone. There were construction activities in the hospital ward during her hospital stay. Due to immediate recurrence of FSGS in the allograft, she received plasma exchange, rituximab, and IVIG. Anti-infective prophylaxis consisted of TMP-SMX, valganciclovir, and nystatin. She developed multiple loculated fluid collections in the abdomen 6 weeks later. Histology of lesions demonstrated suppurative caseating granulomatous inflammation and the AFB culture showed Nocardia farcinica. With the reduction of immunosuppressive agents along with usage of TMP-SMX, imipenem-cilastatin, and linezolid, she had a partial recovery after 9 months with persistent small abscesses but remained asymptomatic clinically. There was no evidence of nocardia infection in lungs and brain. Repeat AFB culture from the lesions was negative. Allograft function remained stable throughout. She remains on oral TMP-SMX therapy. We postulated that she could have acquired nocardia either from the contaminated air particles in the hospital from the construction activities or reactivation of nocardia from prior colonization. Nocardia infection should be suspected in immunocompromised patients with unexplained fever and abdominal pain.

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