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TitleInteraction between atypical microorganisms and E. coli in catheter-associated urinary tract biofilms
Author(s)Azevedo, Andreia
Almeida, Carina
Melo, L. F.
Azevedo, N. F.
KeywordsEscherichia coli
Atypical species
Multispecies biofilms
Urinary tract infections
Urinary catheters
Issue date2014
PublisherTaylor & Francis
CitationAzevedo, A. S.; Almeida, Carina; Melo, L. F.; Azevedo, N. F., Interaction between atypical microorganisms and E. coli in catheter-associated urinary tract biofilms. Biofouling: The Journal of Bioadhesion and Biofilm Research, 30(8), 893-902, 2014
Abstract(s)Most biofilms involved in catheter-associated urinary tract infections (CAUTIs) are polymicrobial, with disease causing (eg Escherichia coli) and atypical microorganisms (eg Delftia tsuruhatensis) frequently inhabiting the same catheter. Nevertheless, there is a lack of knowledge about the role of atypical microorganisms. Here, single and dual-species biofilms consisting of E. coli and atypical bacteria (D. tsuruhatensis and Achromobacter xylosoxidans), were evaluated. All species were good biofilm producers (Log 5.84–7.25 CFU cm−2 at 192 h) in artificial urine. The ability of atypical species to form a biofilm appeared to be hampered by the presence of E. coli. Additionally, when E. coli was added to a pre-formed biofilm of the atypical species, it seemed to take advantage of the first colonizers to accelerate adhesion, even when added at lower concentrations. The results suggest a greater ability of E. coli to form biofilms in conditions mimicking the CAUTIs, whatever the pre-existing microbiota and the inoculum concentration.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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