Delaquis, Pascal, Ph.D.

Research Scientist, Food Microbiology


Contact Information:

Highway 97
Summerland, British Columbia V0H 1Z0
Telephone: 250-494-6367
Fax: 250-494-0755
Email: pascal.delaquis@agr.gc.ca

Areas of Expertise:

  • Ecology and antimicrobial resistance of foodborne pathogens in horticultural crop production
  • Ecology of foodborne pathogens in fresh-cut fruit and vegetable products
  • Microbiological quality of fresh-cut fruits and vegetables
  • Natural antimicrobials from plants and their use in food preservation
  • Wine fermentations

Current Projects:

  • Design, development, engineering and evaluation of low temperature thermal treatment for horticultural products, optimized for quality and safety. Development and evaluation of novel processing equipment capable of producing high quality minimally
  • Studies on the risk of dissemination and fate of foodborne pathogens in field vegetables
  • Assessment and management of biological and chemical contaminants carried in livestock and poultry manure. [GAPS]
  • Methodologies to ensure the microbial safety of fresh fruits and vegetables throughout the distribution system

Affiliations:

  • Adjunct Professor, University of British Columbia

Research Publications:

The links below lead to abstracts with access to full text.

2015

2014

2013

2012

2011

2009

Other Science Related Publications:

2015

  • Bach, S.J. and Delaquis, P.J. (2015). Multistate Research Project S-294. Postharvest Quality and Safety in Fresh-cut Vegetables and Fruits. 2014-2015 Activities Report. (Report)
  • Bach, S.J., Allen, K.J., Delaquis, P.J., and Chen, J. (2015). "Improving the decontamination of fresh produce.", China International Food Safety and Quality Conference (CIFSQ), Beijing, China, November 4-5, 2015, Invited oral presentation.
  • Bach, S.J., Delaquis, P.J., and Allen, K.J. (2015). Development of validated seed disinfection strategies for the organic production of sprouted vegetables. CL02-Organic-Activity 25v1. AAFC Project ID J-000621. (Report)
  • Bach, S.J., Delaquis, P.J., and Harlton, C.E. (2015). "Effect of cold stress on biofilm formation by Shiga toxin-producing Escherichia coli (STEC).", VTEC 2015, Boston, MA, USA, September 13-16, 2015.
  • Bach, S.J., Fan, L., Forney, C.F., and Delaquis, P.J. (2015). "Quality and Safety in Fresh-cut Vegetables and Fruits. United Fresh Produce Association Food Safety and Technology Council.", United Fresh 2015, Chicago, IL, USA, June 9-11, 2015, Oral presentation and handout information on AAFC’s research activities.
  • Bach, S.J., Kostrzynska, M., Bezanson, G.S., and Delaquis, P.J. (2015). Stress-induced behaviors of non-O157 verotoxin-producing Escherichia coli (VTEC) in leafy greens. Research Project Annual Report. AAFC Project ID J-000128. (Report)
  • Bach, S.J., Marden, C., Harlton, C.E., Wahlgren, S., and Delaquis, P.J. (2015). "The response of Shiga toxin-producing Escherichia coli (STEC) to cold stress on plants and fresh-cut Romaine lettuce.", 2015 International Association of Food Protection (IAFP), Portland, Oregon, USA, July 25-28, 2015.
  • Chen, J., Nadya, S., Allen, K.J., Johnson, R., Ziebell, K.A., Bach, S., Topp, E., and Delaquis, P.J. (2015). "Phenotypic and genotypic characterization of antimicrobial resistance in Shiga toxin-producing Escherichia coli isolated from surface water in the Lower Mainland of British Columbia.", VTEC 2015, Boston, MA, USA, September 13-16, 2015. (Abstract)
  • Chen, J., Nadya, S., Allen, K.J., Johnson, R.P., Ziebell, K.A., Zeibell, K., Bach, S.J., Topp, E., and Delaquis, P.J. (2015). "Phenotypic and genotypic characterization of antimicrobial resistance in Shiga toxin-producing Escherichia coli isolated from surface water in the Lower Mainland of British Columbia.", VTEC 2015, Boston, MA, USA, September 13-16, 2015.
  • Delaquis, P.J. and Bach, S. (2015). "Fate of Salmonella enterica, Escherichia coli O157:H7 and Listeria monocytogenes in mung bean, alfalfa and radish seed stored at three levels of relative humidity.", 2015 International Association of Food Protection (IAFP), Portland, Oregon, USA, July 25-28, 2015. (Abstract)
  • Delaquis, P.J. and Bach, S.J. (2015). "Fate of Salmonella enterica, Escherichia coli O157:H7 and Listeria monocytogenes in mung bean, alfalfa and radish seed stored at three levels of relative humidity.", 2015 International Association of Food Protection (IAFP), Portland, Oregon, USA, July 25-28, 2015.
  • Delaquis, P.J., Bach, S.J., Bezanson, G.S., Topp, E., McKellar, R., Blais, B., and Peréz Rodriguez, F. (2015). Phenotypic diversity in Escherichia coli O157:H7 and its influence on survival in leafy vegetables. Research Project Annual Report. AAFC Project ID J-000132. (Report)
  • Delaquis, P.J., Nadya, S., Chen, J., Allen, K.J., Johnson, R., Ziebell, K.A., Bach, S., and Topp, E. (2015). "Prevalence, phenotypic and genotypic characteristics of Shiga toxin-producing Escherichia coli isolated from irrigation waters in a Canadian urban-agricultural landscape.", VTEC 2015, Boston, MA, USA, September 13-16, 2015. (Abstract)
  • Delaquis, P.J., Nadya, S., Chen, J., Allen, K.J., Johnson, R.P., Ziebell, K.A., Bach, S.J., and Topp, E. (2015). "Prevalence, phenotypic and genotypic characteristics of Shiga toxin-producing Escherichia coli isolated from irrigation waters in a Canadian urban-agricultural landscape.", VTEC 2015, Boston, MA, USA, September 13-16, 2015.
  • Diarra, M.S., Delaquis, P.J., Topp, E., McCallum, J.L., Ehret, D.L., Malouin, F., Gong, J., Brar, S.K., and Ross, K.A. (2015). Fruit Pomaces to Improve Immunity and Health of Organic Chickens. Project ID: AIP-CL02 – Organic Science Cluster II; Research Project Annual Report 2014-2015. AIP-CL02 – Organic Science Cluster II. (Report)
  • Falardeau, J., Wang, S., and Delaquis, P.J. (2015). "Taking a Good Look at Irrigation Water is a Good Idea.", Lower Mainland Horticultural Improvement Association Growers’ Short Course, Abbotsford, BC, Canada, January 29, 2015, pp. 108-109.
  • Franz, E., Delaquis, P.J., Morabito, S., Beutin, L., Gobius, K., Rasko, D.A., and others (2015). "Corrigendum to "Exploiting the explosion of information associated with whole genome sequencing to tackle Shiga toxin-producing Escherichia coli (STEC) in global food production systems" [Int. J. Food Microbiol. 187 (2014) 57-72] doi: 10.1016/j.ijfoodmicro.2014.07.002.", International Journal of Food Microbiology, 193, pp. 159. doi : 10.1016/j.ijfoodmicro.2014.09.026
  • Islam, M.R., Lepp, D., Yin, X., Ross, K.A., Delaquis, P.J., Erhet, D., and Diarra, M.S. (2015). "Gut Microbiota of Organic Broiler Chickens Fed with or without Blueberry Pomace", Guelph Food Safety Seminar Series - Food Safety: Compliance to Commitment (GFSS 11th Annual Symposium), Guelph, Ontario, Canada, October 22, 2015, Poster presentation. (Abstract)
  • Villeneuve, S., LeBlanc, D.I., Hashemi Beni, L., Otten, A., Fazil, A.M., McKellar, R., and Delaquis, P.J. (2015). "CanGRASP: the Canadian GIS-based Risk Assessment, Simulation and Planning tool for food safety.", International Congress on Engineering and Food, Engineering Challenges: bridging science and food innovations, Québec city, Canada, June 14-18, 2015, Oral presentation.

2014

  • Allen, K.J. and Delaquis, P.J. (2014). "Current perspectives on the microbiological safety of fresh produce (http://canadianfoodinsights.com/2014/04/01/current-perspectives-microbiological-safety-fresh-produce/).", Canadian Food Insights.
  • Bach, S.J. and Delaquis, P.J. (2014). Multistate Research Project S-294. Postharvest Quality and Safety in Fresh-cut Vegetables and Fruits. 2013-2014 Activities Report. (Report)
  • Bach, S.J., Delaquis, P.J., and Harlton, C.E. (2014). "Stress and Virulence Gene Response of Non-O157 Shiga Toxin-producing Escherichia coli (STEC) Exposed to Low Temperature.", Annual Meeting of the International Association for Food Protection (IAFP), Indianapolis, USA, August 3-6, 2014, Oral presentation. (Abstract)
  • Bach, S.J., Kostrzynska, M., Bezanson, G.S., and Delaquis, P.J. (2014). Stress-induced behaviors of non-O157 verotoxin-producing Escherichia coli (VTEC) in leafy greens. Research Project Annual Report. AAFC Project ID J-000128. (Report)
  • Bovo, F., de Cesare, A., Manfreda, G., Bach, S.J., and Delaquis, P.J. (2014). "Fate of Salmonella enterica in a mixed ingredient salad containing lettuce, cooked chicken and cheese.", Annual Meeting of the International Association for Food Protection (IAFP), Indianapolis, USA, August 3-6, 2014, Oral presentation. (Abstract)
  • Delaquis, P.J., Bach, S.J., Bezanson, G.S., Topp, E., McKellar, R., Blais, B., and Peréz Rodriguez, F. (2014). Phenotypic diversity in Escherichia coli O157:H7 and its influence on survival in leafy vegetables. Research Project Annual Report. AAFC Project ID J-000132. (Report)
  • McKellar, R.C., Peréz Rodriguez, F., Harris, L.J., Moyne, A.-L., Blais, B., Topp, E., Bezanson, G.S., Bach, S.J., and Delaquis, P.J. (2014). "Evaluation of mathematical models to describe Escherichia coli O157:H7 decay on field-grown leafy vegetables.", Annual Meeting of the International Association for Food Protection (IAFP), Indianapolis, USA, August 3-6, 2014, Oral presentation. (Abstract)
  • Nadya, S., Allen, K.J., Johnson, R.P., Ziebell, K.A., Topp, E., Delaquis, P.J., and Bach, S.J. (2014). "A comparison of the presence of total Escherichia coli and Shiga-toxigenic E. coli in irrigation waters from an intensive agricultural region.", United Fresh 2014, Chicago, IL, USA, June 10-14, 2014, Abstract. (Poster)
  • Nadya, S., Allen, K.J., Ziegler, K., Johnson, R., Bach, S.J., and Delaquis, P.J. (2014). "Prevalence of Shiga Toxin-producing Escherichia coli in Irrigation Waters and Fresh Produce in British Columbia, Canada.", Annual Meeting of the International Association for Food Protection (IAFP), Indianapolis, USA, August 3-6, 2014, Oral presentation. (Abstract)
  • Nadya, S., Allen, K.J., and Delaquis, P.J. (2014). "Lower Mainland surface water research – what did we learn?", Proceedings of the Lower Mainland Horticultural Improvement Association Growers’ Short Course, pp. 117-119.

2013

  • Bach, S.J., Bezanson, G.S., Delaquis, P.J., and Kostrzynska, M. (2013). The influence of stress on survival and infectivity of Verotoxin-producing Escherichia coli (VTEC) in ready-to-eat foods. Research Project FINAL Report AAFC RBPI #1848. (Report)
  • Bach, S.J., Delaquis, P.J., Toivonen, P.M.A., and Lu, C. (2013). "Impact of hydrogen peroxide on Escherichia coli O157:H7 in vitro and in vivo on fresh-cut lettuce.", United Fresh 2013, San Diego Convention Center, San Diego, CA, USA, May 14-16, 2013, Abstract. (Poster)
  • Bach, S.J., Delaquis, P.J., Toivonen, P.M.A., and Lu, C. (2013). "The effect of hypoxic treatment of Romaine lettuce on the survival of Escherichia coli O157:H7.", United Fresh 2013, San Diego Convention Center, San Diego, CA, USA, May 14-16, 2013, Abstract. (Poster)
  • Bach, S.J., Guévremont, É., Bezanson, G.S., Brassard, H., Delaquis, P.J., Ells, T.C., Hodges, D.M., Toivonen, P.M.A., and Kostrzynska, M. (2013). Enhancing mitigation strategies for microbiological risks in fresh horticultural products. Research Project FINAL Report AAFC RBPI #1489. (Report)
  • Bach, S.J., Lu, C., Delaquis, P.J., and Toivonen, P.M.A. (2013). "Impact of wound induced hydrogen peroxide production on Escherichia coli O157:H7 in fresh-cut lettuce.", 5th Congress of European Microbiologists (FEMS 2013), Leipzig, Germany, July 21-25, 2013, Presentation. (Poster)
  • Bach, S.J., Toivonen, P.M.A., Lu, C., and Delaquis, P.J. (2013). Multistate Research Project S-294. Postharvest Quality and Safety in Fresh-cut Vegetables and Fruits. 2012-2013 Activities Report. (Report)
  • Delaquis, P.J., Bach, S.J., Lu, C., and Toivonen, P.M.A. (2013). "Effect of environmental factors (field versus controlled environment chamber) on the survival of Escherichia coli O157:H7 on Romaine lettuce.", United Fresh 2013, San Diego Convention Center, San Diego, CA, USA, May 14-16, 2013, Abstract. (Poster)
  • Delaquis, P.J., Bach, S.J., McKellar, R., Bezanson, G.S., and Topp, E. (2013). "Survival of six Shiga-toxigenic Escherichia coli serotypes in field lettuce.", 58th Annual Meeting of the International Association of Food Protection (IAFP 2013), Charlotte Convention Center, Charlotte, NC, USA, July 28-31, 2013. (Poster)
  • Fung, S., Rempel, H., Block, G.S., Chen, W., Janzen, T., Lewis, C.T., Zhang, N., El-Kayssi, N., Bilkhu, S., Hambleton, S., Amoako, K.K., Lévesque, C.A., Bach, S.J., Delaquis, P.J., and Diarra, M.S. (2013). "Bacillus species across Canada's agriculture environment: an ecological perspective.", International conference on Bacillus antracis, B. cereus, and B. thurengiensis, Victoria, BC, Canada, September 1-5, 2013, Abstract. (Poster)
  • Posada-Izquierdo, G.D., Peréz Rodriguez, F., McKellar, R., Carpintero, S., Membrives, F., Garcia-Gimeno, R.M., and Delaquis, P.J. (2013). "Modeling survival of Escherichia coli O157:H7 in lettuce as a function of chlorine concentration.", 58th Annual Meeting of the International Association of Food Protection (IAFP 2013), Charlotte Convention Center, Charlotte, NC, USA, July 28-31, 2013. (Abstract)
  • Simmons, K., Rempel, H., Block, G.S., Delaquis, P.J., Topp, E., and Diarra, M.S. (2013). "Identification and prevalence of Escherichia fergusonii in broiler chickens.", 58th Annual Meeting of the International Association of Food Protection (IAFP 2013), Charlotte Convention Center, Charlotte, NC, USA, July 28-31, 2013.
  • Simmons, K., Rempel, H., Block, G.S., Delaquis, P.J., Topp, E., and Diarra, M.S. (2013). "Identification and prevalence of Escherichia fergusonii in broiler chickens.", 102nd IAFP Meeting, Charlotte, North Carolina, USA, July 28-31, 2013.
  • Toivonen, P.M.A., Lu, C., Bach, S.J., and Delaquis, P.J. (2013). "Hypoxic atmospheres can induce subsequent increases in cutting‐induced hydrogen peroxide production by fresh‐cut Romaine lettuce.", 11th International Controlled and Modified Atmosphere Research Conference, Trani, Italy, June 3-7, 2013. (Poster)
  • Toivonen, P.M.A., Lu, C., Bach, S.J., and Delaquis, P.J. (2013). "Hypoxic treatment can enhance cut-edge hydrogen peroxide production in Romaine lettuce.", United Fresh 2013, San Diego Convention Center, San Diego, CA, USA, May 14-16, 2013, Abstract. (Poster)
  • Topp, E., Lanthier, M., Diarra, M.S., Delaquis, P.J., Bach, S.J., McAllister, T.A., Sharma, R., Inglis, G.D., Masse, D., Bezanson, G.S., Bittman, S., Talbot, G., Masse, L., Brassard, J., Houde, A., Jones, T.H., Lapen, D.R., van Bochove, É., Gannon, V.P.J., Pintar, K.D.M., Masson, L., Neumann, N.F., and Koning, W. (2013). Assessment and management of on-farm fate of microbial and chemical contaminants carried in human and animal wastes used as organic fertilizers. Final Report SAGES #1462. (Report)

2012

  • Bergeron-Quirion, S., Villeneuve, S., LeBlanc, D.I., and Delaquis, P.J. (2012). "Predicting the temperature of leafy vegetables packaged in clamshells during distribution in the cold chain.", 50th National Conference of the Canadian Institute of Food Science and Technology (CIFST's): Innovation meets Commercialization, Niagara Falls, ON, Canada, May 27-29, 2012. (Poster)
  • Bergeron-Quirion, S., Villeneuve, S., LeBlanc, D.I., and Delaquis, P.J. (2012). "Thermophysical properties of pre-washed baby-leaf lettuce and brassica greens packaged in clamshells.", 11th Conference of Food Engineering (CoFE 2012), National Conference Center, Leesburg, VA, USA, April 2-4, 2012. (Poster)
  • Delaquis, P.J. and Bach, S.J. (2012). "Resistance and sub-lethal damage.", in Gómez-López, V.M. (ed.) - Decontamination of Fresh and Minimally Processed Produce, Wiley - Blackwell, Chapter 4, pp. 77-86.
  • Diarra, M.S., Rempel, H., Bach, S.J., Harlton, C.E., Delaquis, P.J., Pritchard, J., Aslam, M.N., Leslie, M., and Topp, E. (2012). "Distribution of antibiotic resistance phenotypes and genotypes among Salmonella spp. Isolated from broiler chickens in British Columbia.", 101st Annual Meeting of the International Association of Food Protection (IAFP 2012), Rhode Island Convention Center, Providence, RI, USA, July 22-25, 2012, Poster ID# 2398. (Poster)
  • Fazil, A.M., Otten, A., Hashemi Beni, L., Villeneuve, S., McKellar, R., Delaquis, P.J., and LeBlanc, D.I. (2012). "A simulation model to predict public health risks of pathogens in a Canadian food distribution system.", Society for Risk Analysis (SRA) 2012 Annual Meeting, San Francisco, CA, USA, December 9-12, 2012, T2-F.4.
  • Fazil, A.M., Otten, A., Hashemi Beni, L., Villeneuve, S., McKellar, R., Delaquis, P.J., and LeBlanc, D.I. (2012). "Développement d’un outil de simulation permettant de prédire les risques de santé publique associés aux dangers microbiologiques présents dans le système canadien de distribution des aliments.", 3e rencontre annuelle de l'Association Québécoise pour I’Innocuité Alimentaire (AQIA), Centre des Congrès de Lévis, Québec City, QC, Canada, September 13, 2012. (Poster)
  • Fazil, A.M., Otten, A., Hashemi Beni, L., Villeneuve, S., McKellar, R., Delaquis, P.J., and LeBlanc, D.I. (2012). "Development of a simulation tool to predict the public health risks associated with microbiological hazards in Canadian food distribution systems.", 50th National Conference of the Canadian Institute of Food Science and Technology (CIFST's): Innovation meets Commercialization, Niagara Falls, ON, Canada, May 27-29, 2012. (Poster)
  • Villeneuve, S., Hashemi Beni, L., Côté, K., LeBlanc, D.I., Fazil, A.M., Otten, A., McKellar, R., and Delaquis, P.J. (2012). "Development of an interactive modeling tool to predict the risks associated with contaminated fresh-cut lettuce in Canadian Distribution Systems.", 101st Annual Meeting of the International Association of Food Protection (IAFP 2012), Rhode Island Convention Center, Providence, RI, USA, July 22-25, 2012.

2011

  • Bach, S.J., Lu, C., Delaquis, P.J., and Toivonen, P.M.A. (2011). "Cutting Romaine lettuce while submerged in sanitizer improves efficacy of sodium hypochlorite.", The Grower, 61(5), pp. 20.
  • Toivonen, P.M.A., Lu, C., Delaquis, P.J., and Bach, S.J. (2011). "Timing of sanitizer application reduces microbial counts on fresh-cut Romaine lettuce.", 2nd ISHS International Conference on Quality Management of Fresh Cut Produce: Convenience Food for a Tasteful Life, Università degli Studi di Torino, Torino, Italy, July 17-21, 2011.

2010

  • Toivonen, P.M.A., Lu, C., Delaquis, P.J., and Bach, S.J. (2010). "Evaluation of timing for application of sanitizing washes to reduce microbial counts on Romaine lettuce.", 14th Annual Federal Food Safety and Nutrition Research Meeting (FFSNRM), Ottawa, ON, Canada, November 3-4, 2010, pp. 28.

2009

  • Bach, S.J. and Delaquis, P.J. (2009). "The origin and spread of human pathogens in fruit production systems.", in Fan, X, Miemira, B., Doona, C., Feeherry, F., and Gravani, B. (eds.) - Microbial Safety of Fresh Produce: Challenges, Perspectives and Strategies, Wiley - Blackwell, Chapter 2, pp. 43-54.
  • Delaquis, P.J., Bach, S.J., LeBlanc, D.I., Brassard, J., Houde, A., Villeneuve, S., Bezanson, G.S., Diarra, M.S., Topp, E., Blais, B., Gajadhar, A., Bisaillon, J.-R., Fazil, A.M., Gilmour, M., Mattison, K., and Bidawid, S. (2009). "A systems-based approach for the assessment of microbiological threats to the food supply.", 13th Annual Federal Food Safety and Nutrition Research Meeting (FFSNRM), Ottawa, ON, Canada, November 4-5, 2009. (Presentation)
  • Toivonen, P.M.A., Delaquis, P.J., and Orban, S. (2009). "Can variability in growth of human pathogens in fresh-cut romaine lettuce be associated with differences in wound-associated metabolism?", 13th Annual Federal Food Safety and Nutrition Research Meeting (FFSNRM), Ottawa, ON, Canada, November 4-5, 2009, pp. 56-57.
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