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- W2038971925 abstract "Malgré les progrès constants dans la prise en charge en réanimation néonatale, l’incidence des sepsis nosocomiaux tardifs (au-delà des 3 premiers jours de vie) demeure élevée et ces infections restent une cause majeure de morbidité et de mortalité. L’espèce Staphylococcus epidermidis est la plus prévalente (> 70 %) dans ce contexte. La fréquence inhabituellement élevée des bactériémies à S. capitis en réanimation néonatale au sein des hospices civils de Lyon (HCL) a motivé une étude détaillée de ce pathogène. Nos résultats ont permis de mettre en évidence la présence endémique d’un clone particulier de S. capitis multirésistant aux antibiotiques (incluant une résistance à la méticilline et aux bêta-lactamines ainsi qu’une hétérorésistance aux glycopeptides) dans les services de réanimation néonatale à Lyon, en France et plus généralement dans plusieurs pays d’Europe et en Australie. Ces données, dont nous présentons dans cette étude une synthèse, posent de nombreuses questions concernant les spécificités de ce clone. Plus généralement, les bactériémies à staphylocoques blancs souvent résistants à la méticilline nécessitent un recours fréquent à la vancomycine en première intention. Or l’abaissement récent par le Comité de l’antibiogramme de la Société française de microbiologie (CA-SFM) des concentrations critiques (seuils de concentrations séparant les populations bactériennes sensibles, intermédiaires et résistantes) utilisées pour la vancomycine sur les staphylocoques conduit à cataloguer comme « résistantes » une proportion non négligeable de souches de staphylocoques blancs. Nous présentons dans cette étude une synthèse des implications et conséquences d’une telle évolution sur le choix de l’antibiothérapie chez les nouveau-nés infectés. Coagulase-negative staphylococci (CoNS) are the most frequent cause of late-onset sepsis (LOS) in neonatal intensive care units (NICUs). Staphylococcus epidermidis is usually considered the most prevalent CoNS in this setting. However, recent reports have identified Staphylococcus capitis, another CoNS, as an emerging cause of bacteremia in NICU wards. S. capitis is the main cause of LOS in several NICUs in France, whereas this species is rarely found in adult patients from the same hospitals. S. capitis isolates from NICU infants share several striking features: they all belong to the same pulsed-field gel electrophoresis type, designated as NRCS-A, which indicates their clonal relatedness; their resistance profile reflects adaptation to antimicrobial agents specifically used in NICUs, including resistance to beta-lactams and aminoglycosides but not to fluoroquinolones, and reduced susceptibility to vancomycin; and they are associated with more severe LOS than those caused by other CoNS. The molecular characterization of NICU S. capitis isolates from several countries has shown that S. capitis NRCS-A strains have disseminated in both Western Europe (France, the United Kingdom, and Belgium) and Australia. The dissemination of such multiresistant strains imposes difficult therapeutic choices on pediatricians. As a consequence of the recent strengthening of the French and European guidelines that regulate the interpretation of clinical vancomycin susceptibility in staphylococci, a non-negligible proportion of NICU CoNS isolates (including S. capitis as well as other CoNS species) that were usually reported as vancomycin-susceptible are now categorized as vancomycin-resistant. In such cases, practitioners are faced with uncomfortable alternatives: the continued use of vancomycin in spite of the pathogen being unambiguously reported as resistant to this molecule and the use of antimicrobial agents such as linezolid or daptomycin that retain an in vitro efficacy against CoNS but whose use in neonates has not received approval by the healthcare authorities. To cope with this emerging challenge, clinical investigations of the relative tolerance and efficacy of vancomycin, linezolid, and daptomycin in NICU infants infected with these newly reported vancomycin-resistant CoNS are urgently needed." @default.
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- W2038971925 date "2013-09-01" @default.
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- W2038971925 title "Actualités sur la prise en charge des infections néonatales nosocomiales tardives à staphylocoque à coagulase négative" @default.
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- W2038971925 doi "https://doi.org/10.1016/j.arcped.2013.06.024" @default.
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