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Using a repetitive-sequence-based (rep)-PCR (DiversiLab), we have molecularly typed Acinetobacter nosocomial bloodstream isolates (Acinetobacter baumannii [n = 187], Acinetobacter pittii [n = 23], and Acinetobacter nosocomialis [n = 61]) obtained from patients hospitalized in U.S. hospitals over a 10-year period (1995-2004) during a nationwide surveillance study (Surveillance and Control of Pathogens of Epidemiological Importance [SCOPE]). Patterns of A. baumannii rep-PCR were compared to those of previously identified international clonal lineages (ICs) and were further investigated by multilocus sequence typing (MLST) to compare the two typing methods. Forty-seven of the A. baumannii isolates clustered with the previously defined IC 2. ICs 1, 3, 6, and 7 were also detected. The remaining 81 isolates were unrelated to the described ICs. In contrast, A. pittii and A. nosocomialis isolates were more heterogeneous, as determined by rep-PCR. Our MLST results were in good correlation with the rep-PCR clusters. Our study confirms previous data indicating the predominance of a few major clonal A. baumannii lineages in the United States, particularly IC 2. The presence in the United States of A. baumannii ICs 1, 2, and 3 from as early as 1995 suggests that global dissemination of these lineages was an early event.

journal of clinical microbiology

Molecular Epidemiology of Acinetobacter baumannii Bloodstream Isolates Obtained in the United States from 1995 to 2004 Using rep-PCR and Multilocus Sequence Typing