Molecular analysis confirmed presence of a metallobetalactamase of GIM-1 genotype. Extended epidemiologic workup, however, did not reveal any factors for transmission, previous hospitalizations, common places of residence moreover Extensive analysis of specimen workup in the laboratory rendered a laboratory associated pseudo-outbreak highly unlikely.
Identical Acinetobacter spp (GIM-1) was found on 8/13 patient data sheets accompanying the positive specimen, as well as PTS cartridges prospectively analyzed. Positive microbiological results were associated with humidity in the cartridges. Moreover the outbreak strain was detected in air samples close to the PTS.
Upon identification of the PTS as cause of the pseudo-outbreak, all clinical infection control measures were lifted, yet, rigorous measures for hygienic handling of PTS stations, cartridges, and transported specimens were introduced. Moreover, the PTS was decontaminated with disinfectants.