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Antibacterial activity against porcine respiratory bacterial pathogens and in vitro biocompatibility of essential oils

  • Geneviève LeBel
  • Katy Vaillancourt
  • Philippe Bercier
  • Daniel GrenierEmail author
Original Paper

Abstract

Bacterial respiratory infections affecting pigs such as pneumonia, pleuropneumonia, and pleurisy, are a major health concern in the swine industry and are associated with important economic losses. This study aimed to investigate the antibacterial activities of essential oils against major swine respiratory pathogens with a view to developing a potential alternative to antibiotics. Their synergistic interactions with the bacteriocin nisin was also examined. Lastly, we assessed the in vitro biocompatibility of the most efficient essential oils using a pig tracheal epithelial cell line. Of the nine essential oils tested, those from cinnamon, thyme, and winter savory were the most active against Streptococcus suis, Actinobacillus pleuropneumoniae, Actinobacillus suis, Bordetella bronchiseptica, Haemophilus parasuis, and Pasteurella multocida, with minimum inhibitory concentrations and minimum bactericidal concentrations ranging from 0.01 to 0.156% (v/v). The main component found in cinnamon, thyme, and winter savory oils were cinnamaldehyde, thymol, and carvacrol, respectively. Treating pre-formed S. suis and A. pleuropneumoniae biofilms with thyme or winter savory oils significantly decreased biofilm viability. We also observed a synergistic growth inhibition of S. suis with mixtures of nisin and essential oils from thyme and winter savory. Concentrations of nisin and cinnamon, thyme and winter savory essential oils that were effective against bacterial pathogens had no effect on the viability of pig tracheal epithelial cells. The present study brought evidence that essential oils are potential antimicrobial agents against bacteria associated with porcine respiratory infections.

Keywords

Porcine respiratory infections Essential oils Biofilm Epithelial cells 

Notes

Acknowledgements

This study was supported by the Natural Sciences and Engineering Research Council of Canada (RGPIN-2015-04146). The authors thank Marcelo Gottschalk (Université de Montréal) for providing the NPTr cell line and the bacterial strains.

Compliance with ethical standards

Conflict of interest

The authors have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Groupe de Recherche en Écologie Buccale (GREB), Faculté de Médecine DentaireUniversité LavalQuebec CityCanada
  2. 2.Centre de Recherche en Infectiologie Porcine et Avicole (CRIPA), Fonds de Recherche du Québec-Nature et Technologies (FRQNT)Saint-HyacintheCanada

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