1887

Abstract

Nocardiosis has been believed to be caused by the members of the complex and the species. However, recent advances in genotypic identification have shown that the genus exhibits considerable taxonomic complexity and the phenotypic markers used in the past for its identification can be ambiguous. The aim of this study was to assess the species distribution of isolates and to determine whether there are differences in pathogenicity or antimicrobial susceptibility between the different species identified. isolates obtained over a 7 year period were retrospectively reviewed. The isolates were identified genotypically, their antibiotic susceptibility was tested and the clinical data of the 27 patients were retrieved. Eight different species were identified: (=9), (=6), (=6), (=2), (=1), complex (=1), (=1) and complex (=1). All species were susceptible to co-trimoxazole but different patterns of susceptibility to other agents were observed. All patients had active comorbidities at the time of infection. A total of 19 patients were immunosuppressed, due to human immunodeficiency virus infection, chronic corticosteroid therapy, immunosupressive therapy or haematological malignancies. Six patients displayed a Charlson comorbidity index score above 4. Global mortality was 50 % while attributable mortality was 34.6 %. Patients infected with – the most resistant species – had the highest Charlson index score and the highest mortality rate. Accurate identification of the species and susceptibility testing of isolates may play an important role in diagnosis and treatment.

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2007-04-01
2024-04-19
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