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    Aerial dissemination of Clostridium difficile spores

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    Publication date
    2008
    Author
    Roberts, K.
    Smith, Caroline F.
    Snelling, Anna M.
    Kerr, Kevin G.
    Banfield, Kathleen R.
    Sleigh, P.A.
    Beggs, Clive B.
    Keyword
    Aerial
    Dissemination
    Clsotridium difficile
    Spores
    Rights
    © 2008 Roberts et al. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://www.creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
    Peer-Reviewed
    Yes
    
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    Abstract
    Clostridium difficile-associated diarrhoea (CDAD) is a frequently occurring healthcare-associated infection, which is responsible for significant morbidity and mortality amongst elderly patients in healthcare facilities. Environmental contamination is known to play an important contributory role in the spread of CDAD and it is suspected that contamination might be occurring as a result of aerial dissemination of C. difficile spores. However previous studies have failed to isolate C. difficile from air in hospitals. In an attempt to clarify this issue we undertook a short controlled pilot study in an elderly care ward with the aim of culturing C. difficile from the air. In a survey undertaken during February (two days) 2006 and March (two days) 2007, air samples were collected using a portable cyclone sampler and surface samples collected using contact plates in a UK hospital. Sampling took place in a six bedded elderly care bay (Study) during February 2006 and in March 2007 both the study bay and a four bedded orthopaedic bay (Control). Particulate material from the air was collected in Ringer's solution, alcohol shocked and plated out in triplicate onto Brazier's CCEY agar without egg yolk, but supplemented with 5 mg/L of lysozyme. After incubation, the identity of isolates was confirmed by standard techniques. Ribotyping and REP-PCR fingerprinting were used to further characterise isolates. On both days in February 2006, C. difficile was cultured from the air with 23 samples yielding the bacterium (mean counts 53 ¿ 426 cfu/m3 of air). One representative isolate from each of these was characterized further. Of the 23 isolates, 22 were ribotype 001 and were indistinguishable on REP-PCR typing. C. difficile was not cultured from the air or surfaces of either hospital bay during the two days in March 2007. This pilot study produced clear evidence of sporadic aerial dissemination of spores of a clone of C. difficile, a finding which may help to explain why CDAD is so persistent within hospitals and difficult to eradicate. Although preliminary, the findings reinforce concerns that current C. difficile control measures may be inadequate and suggest that improved ward ventilation may help to reduce the spread of CDAD in healthcare facilities.
    URI
    http://hdl.handle.net/10454/582
    Citation
    Roberts, K., Smith, C.F., Snelling, A.M., Kerr, K.G., Banfield, K.R., Sleigh, P.A. and Beggs, C.B. (2008).Aerial dissemination of Clostridium difficile spores. BMC Infectious Diseases. Vol. 8 No. 7.
    Link to publisher’s version
    http://www.biomedcentral.com/content/pdf/1471-2334-8-7.pdf
    Type
    Article
    Collections
    Engineering and Informatics Publications

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