Specific type IV pili groups in clinical isolates of Pseudomonas aeruginosa
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The relationships between specific type IV pili (TFP) groups and antibiotic resistance, biofilm formation, and bacterial motility were determined in 190 Pseudomonas aeruginosa clinical isolates. While motility and biofilm formation were determined by phenotypic assays, the presence of TFP was determined by PCR assay and antibiotic susceptibility by disk diffusion. The results showed a high ability to form biofilm (97.4%), multidrug resistance (44.7%), and the presence of a high number of motile isolates. We also found an association between strong biofilm production and multidrug resistance. Furthermore, TFP group III was associated with strong biofilm production. In contrast, the isolates with TFP group II and those without any TFP were associated with non-strong biofilm production. Regarding motility, TFP group II was associated with higher percentages of swarming, swimming, and twitching, while TFP group I showed lower percentages of swarming and twitching, and TFP group III showed lower levels of swarming and swimming. In conclusion, these findings highlight the differences in P. aeruginosa phenotypes related to the presence of specific TFP groups and their potential implications in clinical settings.
KeywordsBacterial motility Swarming Swimming Twitching Multidrug resistance Biofilm
We thank Donna Pringle for idiomatic correction.
This work was supported by internal funds of the Barcelona Institute for Global Health, ISGlobal, and Fondo de Apoyo – Facultad de Medicina – Universidad Peruana Cayetano Heredia (SIDISI 60130). GH has a personal fellowship from the Schlumberger Foundation - Faculty for The Future Program. JR was supported by a fellowship from the I3SNS program (2012–2016) of the ISCIII (grant number: CES11/012) ISGlobal is a member of the CERCA Programme, Generalitat de Catalunya.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
The study was approved by the Ethical Committee of the Universidad Peruana Cayetano Heredia (Lima, Peru) and by the Ethical Committee of Hospital Clinic (Barcelona, Spain).
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