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MRSA outbreak in a tertiary neonatal intensive care unit in Iceland.

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Authors
Kristinsdottir, Iris
Haraldsson, Asgeir
Thorkelsson, Thordur
Haraldsson, Gunnsteinn
Kristinsson, Karl G
Larsen, Jesper
Larsen, Anders Rhod
Thors, Valtyr
Issue Date
2019-09-11

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Citation
MRSA outbreak in a tertiary neonatal intensive care unit in Iceland. 2019, 1-9. doi: 10.1080/23744235.2019.1662083 Infect Dis (Lond)
Abstract
Introduction: Preventing the spread of methicillin-resistant Staphylococcus aureus (MRSA) and understanding the pathophysiology and transmission is essential. This study describes an MRSA outbreak in a neonatal intensive care unit in Reykjavik, Iceland at a time where no screening procedures were active. Materials and methods: After isolating MRSA in the neonatal intensive care unit in 2015, neonates, staff members and parents of positive patients were screened and environmental samples collected. The study period was from 14 April 2015 until 31 August 2015. Antimicrobial susceptibility testing, spa-typing and whole genome sequencing were done on MRSA isolates. Results: During the study period, 96/143 admitted patients were screened for colonization. Non-screened infants had short admissions not including screening days. MRSA was isolated from nine infants and seven parents. All tested staff members were negative. Eight infants and six parents carried MRSA ST30-IVc with spa-type t253 and one infant and its parent carried MRSA CC9-IVa (spa-type t4845) while most environmental samples were MRSA CC9-IVa (spa-type t4845). Whole genome sequencing revealed close relatedness between all ST30-IVc and CC9-IVa isolates, respectively. All colonized infants received decolonization treatment, but 3/9 were still positive when last sampled. Discussion: The main outbreak source was a single MRSA ST30-IVc (spa-type t253), isolated for the first time in Iceland. A new CC9-IVa (spa-type t4845) was also identified, most abundant on environmental surfaces but only in one patient. The reason for the differences in the epidemiology of the two strains is not clear. The study highlights a need for screening procedures in high-risk settings and guidelines for neonatal decolonization.
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https://www.tandfonline.com/doi/full/10.1080/23744235.2019.1662083
ae974a485f413a2113503eed53cd6c53
10.1080/23744235.2019.1662083
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English Journal Articles (Peer Reviewed)

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