No Point Beating Around the Bedpan: Lessons from a Major Intra-Hospital NDM-Producing Escherichia coli Carriage Outbreak : a Mixed-Methods Study.
Le Hir, A.; Vincent, P.; Sardi, F. S.; Giglione, C.; Bouton, N.; Stavris, C.; Maisonobe, L.; Chiche, L.; Fliniaux, C.; Castagnier, M.; Brisson, J.; Rebaudet, S.
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Antimicrobial resistance constitutes a major threat to global public health. Among emerging extensively drug-resistant bacteria (eXDR), carbapenemase-producing Enterobacteriaceae (CPE) expose hospitals to outbreaks through rapid dissemination, and to therapeutic limitations. Through a mixed epidemiological-qualitative methods study, we report the most extensive CPE carriage outbreak known to date in France, which occurred at Hopital Europeen Marseille (HEM) between January and June 2025. By the end of November 2024, the admission of an index patient returning from Senegal carrying an NDM-producing Escherichia coli led to an extensive transmission, despite adherence to national screen and isolate guidelines. More than 7,500 rectal screening tests evidenced 481 CPE carriers (including 343 NDM, 129 OXA-48-like and 9 other CPE), and 14 vancomycin-resistant Enterococcus faecium carriers. This major outbreak conducted to a phenomenal involvement of clinical, technical and administrative teams within the institution. It highlighted operational limitations in current screening, cohorting and biocleaning strategies in the context of hospital-wide outbreak. We describe the outbreak trajectory, the control measures implemented and provide a structured synthesis of lessons learned across organisational, scientific and policy domains.
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