Infections caused by Nocardia species have been infrequently described in bone marrow transplant (BMT) recipients. We reviewed six cases of nocardiosis occurring in our population of BMT recipients and the four cases previously reported in the literature. The rate of nocardial infection at our institution was 0.2% (1 of 554) among autologous BMT recipients and 1.7% (5 of 302) among allogeneic BMT recipients (odds ratio, 9.3 [95% confidence interval, 1.1-80.1]; P = .046). All 10 patients had received immunosuppressive medications, and all but one allogeneic BMT recipient had acute or chronic graft-vs.-host disease (GVHD). Four patients had extensive exposure to soil or dust before nocardiosis developed. Seventy percent of the patients died, but death was less often due to progressive nocardial infection than to complications of GVHD and associated invasive infection with Aspergillus species. Three patients had nocardiosis despite receiving prophylaxis with trimethoprim-sulfamethoxazole (TMP-SMZ) on an intermittent basis two or three times a week. These data show that nocardial infection is an important if infrequent complication of bone marrow transplantation and is associated with a high rate of invasive fungal infection. TMP-SMZ prophylaxis given intermittently does not reliably protect against infection.
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