Mario Jacques

Title: Full time professor (accredited)
Address: Département de pathologie et microbiologie
Faculté de médecine vétérinaire
Campus de Saint-Hyacinthe
3200, rue Sicotte
Saint-Hyacinthe (Québec)
J2S 2M2
Local: 3911
Phone: 450 773-8521 or 514 343-6111, ext. 8348
Fax: 450 778-8108
Web site: My personal web page


After obtaining a doctorate in microbiology from the University of Montreal under the direction of J. de Repentigny and P. Turgeon, Mario Jacques completed post-doctoral studies at the University of Calgary in the J.W. Costerton laboratory. In 1985 he was hired as an assistant researcher in the Department of Pathology and Microbiology at the Faculty of Veterinary Medicine at the Université de Montréal. He is currently a full professor in this department and director of the strategic research cluster on optimal milk quality (Op+Lait). His research focuses on the study of virulence factors involved in colonization and in the formation of biofilms by pathogenic bacteria.


  • Coralie Goetz, Ph.D. student
  • Ibtissem Doghri, postdoctoral fellow
  • Josée Labrie, M.Sc. (Op+Lait research cluster manager)


  • Bacteriology

Research topics

  • Formation of biofilms by pathogenic bacteria
  • Characterization of “antibiofilm” molecules
  • In vitro study of mixed bacterial-virus infections


  • Gaudreau, A.M., J. Labrie, C. Goetz, S. Dufour, and M. Jacques. 2018. Evaluation of MALDI-TOF mass spectrometry for the identification of bacteria growing as biofilms. Journal of Microbiological Methods 145:79-81.
  • Hernandez Reyes, Y., C. Provost, C.K. Traesel, M. Jacques, and C.A. Gagnon. 2018. Actinobacillus pleuropneumoniae culture supernatant antiviral effect against porcine reproductive and respiratory syndrome virus occurs prior to the viral genome replication and transcription through actin depolymerization. Journal of Medical Microbiology 67:249-264.
  • Sicard, J.-F., G. Le Bihan, P. Vogeleer, M. Jacques, and J. Harel. 2017. Interactions of intestinal bacteria with components of the intestinal mucus. Frontiers in Cellular and Infection Microbiology 7: 387.
  • Goetz, C., Y.D.N. Tremblay, D. Lamarche, A. Blondeau, A.M. Gaudreau, J. Labrie, F. Malouin, and M. Jacques. Coagulase-negative staphylococci species affect biofilm formation of other coagulase-negative and coagulase-positive staphylococci. Journal of Dairy Science 100: 6454-6464.
  • Tremblay, Y.D.N., J. Labrie, S. Chénier, and M. Jacques. Actinobacillus pleuropneumoniae grows as aggregates in the lung of pigs: Is it time to refine our in vitro biofilm assays? Microbial Biotechnology 10: 756-760.