durée de vie des bactéries

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  • #7730
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    American Society for Microbiology vol.17 No.4 (Oct.2004)

    Contamination – re: inanimate surfaces.

    Persistence of nosocomial pathogens on inanimate surfaces is important because of the
    high rate of acquisition of pathogens on the hands after contact with environmental surfaces.

    PATHOGEN DURATION OF PERSISTENCE ON INANIMATE SURFACES

    Acinetobacter spp. 3 days-5 mo
    B. cereus Unknown
    C. difficile >24 h (vegetative cells) up to 5 mo (spores)
    E. coli 2 h-16 mo
    "Gram-negative bacteria" Unknown
    Influenzavirus, 12-48 h
    parainfluenzavirus
    HAV 2 h-60 days
    HVC Unknown
    Klebsiella spp. 2 h-30 mo
    MRSA 4 wk-7 mo
    P. vulgaris 1-2 days
    Pseudomonas spp. 6 h-16 mo
    Rhinovirus 2 h-7 days
    Rotavirus 6-60 days
    Salmonella spp. 6 h-4.2 yr
    S. marcescens 3 days-2 mo
    S. aureus 4 wk-7 mo
    VRE 5 days-4 mo
    " Yeasts," including Candida spp. 1-150 days
    and Torulopsis glabrata

    Gram-Positive Bacteria

    S. aureus can survive on hands for at least 150 min; VRE survives on hands or gloves for up to 60 min.
    On inanimate surfaces, S. aureus and MRSA may survive for 7 months, with wild strains surviving
    longer than laboratory strains. VRE may survive on surfaces for 4 months. The long survival on surfaces,
    together with the relatively short survival on hands, suggests that contaminated surfaces well be the source
    of transient colonization despite negative hand cultures.

    Gram-Negative Bacteria

    Most gram-negative bacteria survive on the hands for 1 h or more. Survival on inanimate surfaces has been
    reported to be different for the different gram-negative species, with most of them surviving for many months.
    In general, gram-negative bacteria survive for longer on inanimate surfaces than on human skin.

    Spore-Forming Bacteria

    Vegetative cells of C. difficile can survive for at least 24 h on inanimate surfaces, and spores survive for up to 5 months.

    Fungi

    On fingertips, only 20% of viable cells of C. albicans and C. parapsilosis remain detectable after 1 h.
    Candida spp. can survive on surfaces for up to 150 days. During this period of survival, most yeast
    cells die within the first few minutes.

    Viruses

    Persistence of viruses on the hands has been investigated mainly for fecal
    and respiratory tract viruses. Artificial contamination of hand with HAV led
    to an immediate-recovery rate of 70.5% (Sattar). HAV persisted for several hours
    on human hands (Sattar). With poliovirus, the immediate-recovery rate was 22% but
    the whole inoculum was recovered after 150 min, indicating an almost complete
    persistence of poliovirus on hands. Rotavirus has been described as persisting
    on the hands for up to 260 min, with 57% recovery after 20 min, 42.6% recovery
    after 60 min, and 7.1% after 260 min (Sattar). It can be transferred from contaminated
    hands to clean hands, with 6.6% of the viral contamination transferred 20 min after
    contamination and 2.8% of the viral contamination transferred 60 min after
    contamination (Sattar). Rotavirus has been described to persist better on hands than
    rhinovirus or parainfluenzavirus (Sattar)

    Many enveloped viruses as influenza virus, parainfluenza virus, and cytomegalovirus
    may survive on the hands for 10 to 15 min or even up to 2 h (herpes simplex virus type 1).
    Adenoviruses have been described to persist on human skin for many hours (Sattar).

    Only a few studies of the persistence of viruses on surfaces have been performed.
    Rotavirus and HAV can persist for up to 60 days depending on the room temperature,
    air humidity, and type of surface (Sattar). HIV remains infective on surfaces for up to 7 days,
    depending on the inoculum and the type of preparation (cell-associated virus or cell-
    free virus). HIV obtained from clinical specimens remains infective for a few days.
    Influenza A virus may persist on steel for up to 48 h; on other surfaces, such as paper
    or handkerchiefs, the virus persist for up to 12 h. Rhinovirus may persist up to 7 days.

    Russell Johnson

    RSSL MEDICAL SYSTEMS INC.
    5354 rue Snowdon
    Montréal (Québec) H3X 1Y4
    Tél. : (514) 236-7019
    Téléc. / Fax : (514) 486-3624
    Courriel / E-Mail: [email protected]

    #5873
    Anonyme
    Invité

    dkljflds

    #5874
    Anonyme
    Invité

    Bonjour Monsieur
    Merci beaucoup pour l’info. Voici mon adresse courriel au travail;

    [email protected]

    Manon Dinel

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