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- W1996016061 abstract "Le genre Pneumocystis désigne des micromycètes atypiques et opportunistes infectant les mammifères. Son cycle se déroule au niveau de l’alvéole pulmonaire et comporte différentes formes dont la taille est comprise entre 2 et 8 microns : formes trophiques, prékystes et kystes matures. Pneumocystis jirovecii désigne l’espèce infectant l’homme. Chez les patients immunodéprimés, P. jirovecii est responsable de pneumopathies interstitielles sévères, ou pneumonie à Pneumocystis (PPC), fatale en l’absence de traitement. P. jirovecii peut aussi coloniser des sujets immunocompétents, y compris les personnels soignants. Chez les patients ayant une pathologie pulmonaire chronique sous-jacente, la colonisation contribue à la dégradation des fonctions respiratoires. La transmission de Pneumocystis s’effectue par voie aérienne et des épidémies de PPC nosocomiales ont été décrites. Pneumocystis ne pouvant être cultivé, la mise en évidence du champignon dans l’air peut être réalisée par la détection de son ADN. Des études récentes ont montré que l’ADN de Pneumocystis pouvait être retrouvé et quantifié dans l’environnement des patients hospitalisés atteints de PPC, avec une diffusion pouvant s’étendre au-delà de leurs chambres. La morphologie des stades aériens de Pneumocystis n’est, cependant, toujours pas connue. Différents arguments expérimentaux et épidémiologiques indiquent que les sujets colonisés contribuent à la transmission de P. jirovecii, mais aucune étude n’a été réalisée, à ce jour, sur l’excrétion et la diffusion de Pneumocystis à partir de ces sujets. Ces nouvelles données sur la diffusion et le génotypage de Pneumocystis conduisent à actualiser les recommandations de prévention de la transmission de P. jirovecii en milieu hospitalier. The genus Pneumocystis designates atypical and opportunistic micromycetes infecting mammals. Its life-cycle in the pulmonary alveoli includes several forms, which sizes are comprised between 2 and 8 μm: trophic forms, intermediate stages called precysts and mature cysts. Pneumocystis jirovecii designates the human specific species of Pneumocystis. In immunocompromised patients, this species is responsible for a severe interstitial alveolar lung disease, Pneumocystis pneumonia (PCP), which is fatal without specific treatment. P. jirovecii can also colonize immunocompetent subjects, including health care workers. In patients with underlying chronic pulmonary diseases, this colonization contributes to the worsening of respiratory functions. Pneumocystis transmission occurs by the airborne route and there are several genotypic evidence that P. jirovecii is responsible for nosocomial outbreaks. Pneumocystis cannot be cultured but its DNA can be detected in air. Recent studies allowed quantifying Pneumocystis DNA in the surrounding air of hospitalized patients with PCP, showing its diffusion even outside the patient's room. However, the morphology of the airborne stage(s) of Pneumocystis is still not known. Several lines of evidence indicate that colonized hosts contribute to the widespread of Pneumocystis and to its transmission, but no study has been realized so far on the excretion and diffusion of Pneumocystis from colonized subjects. The new knowledge of airborne diffusion and genotyping of P. jirovecii, led to update the recommendations for prevention of P. jirovecii transmission in the hospital setting." @default.
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- W1996016061 date "2011-11-01" @default.
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- W1996016061 title "Transmission de Pneumocystis : quel risque environnemental et nosocomial ?" @default.
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