期刊
CLINICAL INFECTIOUS DISEASES
卷 61, 期 2, 页码 145-154出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cid/civ225
关键词
Acinetobacter baumannii; virulence; outbreak; extensively drug resistant
资金
- Defense Medical Research and Development Program [D61_I_10_J2_160]
- Armed Forces Health Surveillance Center's Global Emerging Infections Surveillance and Response System
- Military Infectious Diseases Research Program
- Defense Medical Research and Development Program
- US Army Medical Command
Background. Severe Acinetobacter baumannii infections in immunocompetent patients are uncommon, and the virulence mechanisms of this organism are not fully understood. Methods. Following an outbreak of fatal A. baumannii infections in a cohort of relatively immunocompetent patients (low comorbidity and illness severity scores), isolates were investigated with comparative genomics and in animal models. Results. Two unrelated A. baumannii clades were associated with the outbreak. The clone associated with the majority of patient deaths, clade B, is evolutionarily distinct from the 3 international clonal complexes, belongs to multilocus sequence type (MLST) 10, and is most closely related to strains isolated from the Czech Republic, California, and Germany in 1994, 1997, and 2003, respectively. In 2 different murine models, clade B isolates were more virulent than comparator strains, including the highly virulent reference strain AB5075. The most virulent clade B derivative, MRSN 16897, was isolated from the patient with the lowest combined comorbidity/illness severity score. Clade B isolates possess a unique combination of putative virulence genes involved in iron metabolism, protein secretion, and glycosylation, which was leveraged to develop a rapid and specific clinical assay to detect this clade that cannot be distinguished by MLST. Conclusions. Clade B warrants continued surveillance and investigation.
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