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Title: Hypervirulent Klebsiella pneumoniae serotype K1 clinical isolates form robust biofilms at the air-liquid interface
Author: Cubero, Meritxell
Martí Martí, Sara
Domínguez Luzón, Ma. Ángeles (María Ángeles)
González Díaz, Aida
Berbel, Dámaris
Ardanuy Tisaire, María Carmen
Keywords: Klebsiella pneumoniae
Estudis de viabilitat
Klebsiella pneumoniae
Feasibility studies
Issue Date: 18-Sep-2019
Publisher: Public Library of Science (PLoS)
Abstract: The prevalence of a new hypervirulent and hypermucoviscous K. pneumoniae phenotype (Hmv) is increasing worldwide, mainly linked to serotypes K1 and K2. Since capsular thickness can directly affect the capability to form biofilms, we aimed to evaluate the association between the Hmv phenotype with adhesion and biofilm formation in a collection of clinical K. pneumoniae isolates. We selected 38 Hmv clinical isolates [15 serotype K1; 9 serotype K2; 3 non-K1/K2 (rmpA+); 11 non-K1/K2 (rmpA-)] and 7 non-Hmv clinical isolates. The Hmv phenotype was assessed through the mucoviscosity test. Serum resistance was determined by bacterial viability tests in pooled human serum. Adhesion was evaluated with the Biofilm Ring Test®, and biofilm formation was identified by crystal violet staining (Solid-Liquid, SLI-biofilm) or visual examination (Air-Liquid, ALI-biofilm). This study linked for the first time the formation of robust ALI-biofilm plugs by K. pneumoniae to the capsular serotype K1, a group of hypervirulent strains which are generally highly susceptible to the antimicrobial agents. Among all the studied isolates, the capsular serotype K1 presented lower initial adhesion despite having the adhesins mrkD and fimH but higher ALI-biofilm formation than isolates with other capsular serotypes (K2 or non-K1/K2). This structure might confer increased resistance to a group of hypervirulent K. pneumoniae serotype K1.
Note: Reproducció del document publicat a:
It is part of: PLoS One, 2019, vol. 14, num. 9, p. e0222628
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ISSN: 1932-6203
Appears in Collections:Articles publicats en revistes (Patologia i Terapèutica Experimental)
Articles publicats en revistes (Medicina)
Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))

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