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Open AccessArticle

Selection of Bacteriophages to Control In Vitro 24 h Old Biofilm of Pseudomonas aeruginosa Isolated from Drinking and Thermal Water

1
Centre Scientifique et Technique du Bâtiment, Plateforme AQUASIM, 44300 Nantes, France
2
Institut Mines Télécom Atlantique, Laboratoire de Génie des Procédés Environnement Agro-alimentaire (UMR CNRS 6144), 44300 Nantes, France
*
Author to whom correspondence should be addressed.
Viruses 2019, 11(8), 749; https://doi.org/10.3390/v11080749
Received: 12 June 2019 / Revised: 10 August 2019 / Accepted: 11 August 2019 / Published: 13 August 2019
(This article belongs to the Special Issue Bacteriophages and Biofilms)
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Abstract

Pseudomonas aeruginosa is an opportunistic pathogen that causes public healthcare issues. In moist environments, this Gram-negative bacterium persists through biofilm-associated contamination on surfaces. Bacteriophages are seen as a promising alternative strategy to chemical biocides. This study evaluates the potential of nine lytic bacteriophages as biocontrol treatments against nine environmental P. aerginosa isolates. The spot test method is preliminarily used to define the host range of each virus and to identify their minimum infectious titer, depending on the strain. Based on these results, newly isolated bacteriophages 14.1, LUZ7, and B1 are selected and assessed on a planktonic cell culture of the most susceptible isolates (strains MLM, D1, ST395E, and PAO1). All liquid infection assays are achieved in a mineral minimum medium that is much more representative of real moist environments than standard culture medium. Phages 14.1 and LUZ7 eliminate up to 90% of the PAO1 and D1 bacterial strains. Hence, their effectiveness is evaluated on the 24 h old biofilms of these strains, established on a stainless steel coupon that is characteristic of materials found in thermal and industrial environments. The results of quantitative PCR viability show a maximum reduction of 1.7 equivalent Log CFU/cm2 in the coupon between treated and untreated surfaces and shed light on the importance of considering the entire virus/host/environment system for optimizing the treatment. View Full-Text
Keywords: bacteriophages; Pseudomonas aeruginosa isolates; planktonic cells; biofilms; stainless steel surfaces; disinfection; viability q-PCR bacteriophages; Pseudomonas aeruginosa isolates; planktonic cells; biofilms; stainless steel surfaces; disinfection; viability q-PCR
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Magin, V.; Garrec, N.; Andrés, Y. Selection of Bacteriophages to Control In Vitro 24 h Old Biofilm of Pseudomonas aeruginosa Isolated from Drinking and Thermal Water. Viruses 2019, 11, 749.

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