Background: The objective of this study was to evaluate the virulence of P. aeruginosa ventilator-associated pneumonia (VAP) strains (cases) in terms of biofilm production and other phenotypic and genotypic virulence factors compared to P. aeruginosa strains isolated from other infections (controls). Methods: Biofilm production was tested to assess biomass production and metabolic activity using crystal violet binding assay and XTT assay, respectively. Pigment production (pyocyanin and pyoverdine) was evaluated using cetrimide agar. Virulence genes were detected by conventional multiplex PCR and virulence was tested in an in vivo model in Galleria mellonella larvae. Results: We did not find statistically significant differences between VAP and no-VAP strains (p > 0.05) regarding biofilm production. VAP strains had no production of pyocyanin after 24 h of incubation (p = 0.023). The distribution of virulence genes between both groups were similar (p > 0.05). VAP strains were less virulent than non-VAP strains in an in vivo model of G. mellonella (p < 0.001). Conclusion: The virulence of VAP-Pseudomonas aeruginosa does not depend on biofilm formation, production of pyoverdine or the presence of some virulence genes compared to P. aeruginosa isolated from non-invasive locations. However, VAP strains showed attenuated virulence compared to non-VAP strains in an in vivo model of G. mellonella.

Characterization of the virulence of Pseudomonas aeruginosa strains causing ventilator-associated pneumonia / Alonso, Beatriz; Fernández-Barat, Laia; DI DOMENICO, Enea Gino; Marín, Mercedes; Cercenado, Emilia; Merino, Irene; de Pablos, Manuela; Muñoz, Patricia; Guembe, María. - In: BMC INFECTIOUS DISEASES. - ISSN 1471-2334. - 20:1(2020), pp. 1-8. [10.1186/s12879-020-05534-1]

Characterization of the virulence of Pseudomonas aeruginosa strains causing ventilator-associated pneumonia

Enea Gino Di Domenico;
2020

Abstract

Background: The objective of this study was to evaluate the virulence of P. aeruginosa ventilator-associated pneumonia (VAP) strains (cases) in terms of biofilm production and other phenotypic and genotypic virulence factors compared to P. aeruginosa strains isolated from other infections (controls). Methods: Biofilm production was tested to assess biomass production and metabolic activity using crystal violet binding assay and XTT assay, respectively. Pigment production (pyocyanin and pyoverdine) was evaluated using cetrimide agar. Virulence genes were detected by conventional multiplex PCR and virulence was tested in an in vivo model in Galleria mellonella larvae. Results: We did not find statistically significant differences between VAP and no-VAP strains (p > 0.05) regarding biofilm production. VAP strains had no production of pyocyanin after 24 h of incubation (p = 0.023). The distribution of virulence genes between both groups were similar (p > 0.05). VAP strains were less virulent than non-VAP strains in an in vivo model of G. mellonella (p < 0.001). Conclusion: The virulence of VAP-Pseudomonas aeruginosa does not depend on biofilm formation, production of pyoverdine or the presence of some virulence genes compared to P. aeruginosa isolated from non-invasive locations. However, VAP strains showed attenuated virulence compared to non-VAP strains in an in vivo model of G. mellonella.
2020
Pseudomonas aeruginosa, Ventilator-associated pneumonia, Virulence genes, Biofilm, Galleria mellonella
01 Pubblicazione su rivista::01a Articolo in rivista
Characterization of the virulence of Pseudomonas aeruginosa strains causing ventilator-associated pneumonia / Alonso, Beatriz; Fernández-Barat, Laia; DI DOMENICO, Enea Gino; Marín, Mercedes; Cercenado, Emilia; Merino, Irene; de Pablos, Manuela; Muñoz, Patricia; Guembe, María. - In: BMC INFECTIOUS DISEASES. - ISSN 1471-2334. - 20:1(2020), pp. 1-8. [10.1186/s12879-020-05534-1]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1635577
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