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- Title
Influence of Genospecies of Acinetobacter baumannii Complex on Clinical Outcomes of Patients with Acinetobacter Bacteremia.
- Authors
Chuang, Yu-Chung; Sheng, Wang-Huei; Li, Shu-Ying; Lin, Yu-Chi; Wang, Jann-Tay; Chen, Yee-Chun; Chang, Shan-Chwen
- Abstract
This prospective observational study revealed that genospecies 2 of A. calcoaceticus-A. baumannii complex not only exhibited higher antimicrobial resistance than other genospecies of A. calcoaceticus-A. baumannii complex, but predicted higher mortality rate among patients with A. calcoaceticus-A. baumannii complex bacteremia.Background. Acinetobacter baumannii complex infections are increasing in prevalence and are associated with a high mortality. Biochemical classification tests cannot differentiate A. baumannii (genospecies 2) from other genospecies. Genospecies typing offers a potential tool to determine whether there are major differences in pathogenicity among the genospecies.Methods. Adult patients with A. baumannii complex bacteremia in intensive care units were prospectively observed from January 2007 through July 2009. A. baumannii complex was identified by biochemical methods and the Phoenix bacterial identification system. Genospecies were identified by 16S-23S ribosomal RNA intergenic-spacer sequencing.Results. Among the 135 patients with A. baumannii complex bacteremia, 87 (64.4%) had isolates that belonged to genospecies 2, 36 (26.7%) had isolates that belonged to genospecies 13TU, and 12 (8.9%) had isolates that belonged to genospecies 3. Patients with A. baumannii (genospecies 2) bacteremia were more likely to have pneumonia than were patients with bacteremia due to genospecies 13TU (63.2 % vs 27.8%; P =.001), whereas patients with bacteremia due to genospecies 13TU were more likely to have primary bacteremia (69.4% vs 20.7%; P <.001). Genospecies 2 was less susceptible to antibiotics than were other genospecies. It was associated with a higher rate of mortality than was genospecies 13TU (58.6% vs 16.7%; P < .001). On multivariate analysis, genospecies 2 was an independent predictor of mortality (odds ratio, 5.46; 95% confidence interval, 2.00–14.91; P = .001).Conclusions. Genospecies 2 of the A. baumannii complex was associated with greater resistance to antibiotics and higher mortality among bacteremic patients, compared with other genospecies, especially genospecies 13TU. These findings emphasize the need to focus on genospecies to better understand the pathogenesis and epidemiology of infections caused by the A. baumannii complex.
- Subjects
ACINETOBACTER baumannii; HEALTH outcome assessment; BACTEREMIA; LONGITUDINAL method; SCIENTIFIC observation; MORTALITY; RIBOSOMAL RNA
- Publication
Clinical Infectious Diseases, 2011, Vol 52, Issue 3, p352
- ISSN
1058-4838
- Publication type
Article
- DOI
10.1093/cid/ciq154