No Correlation between Biofilm-Forming Capacity and Antibiotic Resistance in Environmental Staphylococcus spp.

Autor(en)

Matthew Gavino Donadu, Marco Ferrari, Vittorio Mazzarello, Stefania Zanetti, Ivan Kushkevych, Simon K-M R Rittmann, Anette Stájer, Zoltán Baráth, Dóra Szabó, Edit Urbán, Márió Gajdács

Abstrakt

The production of biofilms is a critical factor in facilitating the survival of Staphylococcus spp. in vivo and in protecting against various environmental noxa. The possible relationship between the antibiotic-resistant phenotype and biofilm-forming capacity has raised considerable interest. The purpose of the study was to assess the interdependence between biofilm-forming capacity and the antibiotic-resistant phenotype in 299 Staphylococcus spp. (S. aureus n = 143, non-aureus staphylococci [NAS] n = 156) of environmental origin. Antimicrobial susceptibility testing and detection of methicillin resistance (MR) was performed. The capacity of isolates to produce biofilms was assessed using Congo red agar (CRA) plates and a crystal violet microtiter-plate-based (CV-MTP) method. MR was identified in 46.9% of S. aureus and 53.8% of NAS isolates (p > 0.05), with resistance to most commonly used drugs being significantly higher in MR isolates compared to methicillin-susceptible isolates. Resistance rates were highest for clindamycin (57.9%), erythromycin (52.2%) and trimethoprim-sulfamethoxazole (51.1%), while susceptibility was retained for most last-resort drugs. Based on the CRA plates, biofilm was produced by 30.8% of S. aureus and 44.9% of NAS (p = 0.014), while based on the CV-MTP method, 51.7% of S. aureus and 62.8% of NAS were identified as strong biofilm producers, respectively (mean OD570 values: S. aureus: 0.779±0.471 vs. NAS: 1.053±0.551; p < 0.001). No significant differences in biofilm formation were observed based on MR (susceptible: 0.824 ± 0.325 vs. resistant: 0.896 ± 0.367; p = 0.101). However, pronounced differences in biofilm formation were identified based on rifampicin susceptibility (S: 0.784 ± 0.281 vs. R: 1.239 ± 0.286; p = 0.011). The mechanistic understanding of the mechanisms Staphylococcus spp. use to withstand harsh environmental and in vivo conditions is crucial to appropriately address the therapy and eradication of these pathogens.

Organisation(en)

Department für Funktionelle und Evolutionäre Ökologie

Externe Organisation(en)

Università degli Studi di Sassari, Masaryk University, University of Szeged, Semmelweis University , University of Pécs

Journal

Pathogens

Band

11

Anzahl der Seiten

14

ISSN

2076-0817

DOI

https://doi.org/10.3390/pathogens11040471

Publikationsdatum

04-2022

Peer-reviewed

Ja

ÖFOS 2012

106022 Mikrobiologie

Schlagwörter

ASJC Scopus Sachgebiete

Microbiology (medical), Infectious Diseases, Immunology and Microbiology(all), Molecular Biology, Immunology and Allergy

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/no-correlation-between-biofilmforming-capacity-and-antibiotic-resistance-in-environmental-staphylococcus-spp(2b447ec3-e418-4b99-8f3e-0580603bffe8).html