Laboratory evaluation of an outbreak of nocardiosis in immunocompromised hosts

The American Journal of Medicine
D A StevensE T Houang

Abstract

Seven patients in a renal unit were proved to have nocardiosis in an interval of nine months. Six of these patients had received renal transplants. Serologic investigation suggested that two additional cases of undiagnosed pulmonary disease were also nocardial, and that there were no subclinical cases in patients or staff. Clinical-serologic correlations indicate that serologic evaluation may be a useful adjunct in diagnosis of nocardiosis, if used early and repeatedly, and to follow response to therapy. Epidemiologic investigations yielded cultures of Nocardia asteroides from air and dust inside the unit and elsewhere in the hospital. Biochemical, metabolic, physical and immunologic characterization of the isolates indicated that those from patients and those from the unit environment were identical, whereas some from outside the unit could be differentiated from these. The "epidemic strain" had type III antigen, which surveys indicated is not the most common type in human nocardiosis (it occurs in association with a minority of human cases). The isolates were of subgroup B, which has been associated with virulence. The characterization methods employed could be useful in studies of nocardial epidemiology. The laboratory studi...Continue Reading

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