Survival of Inoculated Campylobacter jejuni and Escherichia coli O157:H7 on Kale During Refrigerated Storage. 2023

Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
Virgnia Tech, Department of Food Science and Technology, 1230 Washington St, Blacksburg, VA 24061, USA.

Campylobacter and pathogenic Escherichia coliillnesses have been attributed to the consumption of fresh produce. The leafy green, kale, is increasingly consumed raw. In comparison to other leafy greens, kale has a longer shelf-life. Due to the extended shelf-life of kale, it is warranted to examine the survival of pathogenic Campylobacter jejuni and E. coli O157:H7 inoculated on the surface of kale stored in a controlled environment at 4 ± 1.4°C, and average humidity of 95 ± 1.9% over a 23-day period. At predetermined time points (days 0, 1, 2, 3, 5, 7, 9, 11, 13, 15, 17, 19, and 21), inoculated kale was destructively sampled and the surviving bacteria determined by serial dilution and plating onto Tryptic soy agar, Charcoal cefoperozone deoxycholate agar, and Eosin methylene blue for total aerobic bacteria, C. jejuni, and E. coli O157:H7, respectively. Enrichment and PCR were used for detection when pathogens were not detected using serial dilution and plating. Aerobic heterotrophic bacteria increased over the 23-day period, in contrast, significant declines in the inoculated pathogens were observed. Inoculated E. coli O157:H7 survived longer on kale (up to 19 d); in comparison, C. jejuni was undetectable by day 13 using enrichment and PCR or plating. In conclusion, C. jejuni and E. coli O157:H7 declined on fresh kale over time when held at refrigerated temperatures but were still detected during the majority of the time when the kale would likely still be considered edible by consumers.

UI MeSH Term Description Entries
D001937 Brassica A plant genus of the family Cruciferae. It contains many species and cultivars used as food including cabbage, cauliflower, broccoli, Brussel sprouts, kale, collard greens, MUSTARD PLANT; (B. alba, B. junica, and B. nigra), turnips (BRASSICA NAPUS) and rapeseed (BRASSICA RAPA). Broccoli,Brussel Sprout,Cabbage,Cauliflower,Collard Green,Kale,Cabbages,Collard Greens
D005516 Food Microbiology The presence of bacteria, viruses, and fungi in food and food products. This term is not restricted to pathogenic organisms: the presence of various non-pathogenic bacteria and fungi in cheeses and wines, for example, is included in this concept. Microbiology, Food
D000362 Agar A complex sulfated polymer of galactose units, extracted from Gelidium cartilagineum, Gracilaria confervoides, and related red algae. It is used as a gel in the preparation of solid culture media for microorganisms, as a bulk laxative, in making emulsions, and as a supporting medium for immunodiffusion and immunoelectrophoresis.
D013696 Temperature The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms. Temperatures
D013997 Time Factors Elements of limited time intervals, contributing to particular results or situations. Time Series,Factor, Time,Time Factor
D015169 Colony Count, Microbial Enumeration by direct count of viable, isolated bacterial, archaeal, or fungal CELLS or SPORES capable of growth on solid CULTURE MEDIA. The method is used routinely by environmental microbiologists for quantifying organisms in AIR; FOOD; and WATER; by clinicians for measuring patients' microbial load; and in antimicrobial drug testing. Agar Dilution Count,Colony-Forming Units Assay, Microbial,Fungal Count,Pour Plate Count,Spore Count,Spread Plate Count,Streak Plate Count,Colony Forming Units Assay, Microbial,Colony Forming Units Assays, Microbial,Agar Dilution Counts,Colony Counts, Microbial,Count, Agar Dilution,Count, Fungal,Count, Microbial Colony,Count, Pour Plate,Count, Spore,Count, Spread Plate,Count, Streak Plate,Counts, Agar Dilution,Counts, Fungal,Counts, Microbial Colony,Counts, Pour Plate,Counts, Spore,Counts, Spread Plate,Counts, Streak Plate,Dilution Count, Agar,Dilution Counts, Agar,Fungal Counts,Microbial Colony Count,Microbial Colony Counts,Pour Plate Counts,Spore Counts,Spread Plate Counts,Streak Plate Counts
D016123 Campylobacter jejuni A species of bacteria that resemble small tightly coiled spirals. Its organisms are known to cause abortion in sheep and fever and enteritis in man and may be associated with enteric diseases of calves, lambs, and other animals. Campylobacter fetus subsp. jejuni,Vibrio hepaticus,Vibrio jejuni
D019453 Escherichia coli O157 A verocytotoxin-producing serogroup belonging to the O subfamily of Escherichia coli which has been shown to cause severe food-borne disease. A strain from this serogroup, serotype H7, which produces SHIGA TOXINS, has been linked to human disease outbreaks resulting from contamination of foods by E. coli O157 from bovine origin. E coli O157,E coli O157-H7,Escherichia coli O157-H7

Related Publications

Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
January 2015, Biocontrol science,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
February 2011, Journal of food protection,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
February 2012, Journal of food protection,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
August 2006, Journal of food protection,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
August 1998, Journal of food protection,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
February 2017, Journal of microbiology and biotechnology,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
September 1999, Journal of food protection,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
September 2014, Journal of food science,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
November 1999, Journal of food protection,
Auja Bywater, and Kathleen Alexander, and Joseph Eifert, and Laura K Strawn, and Monica A Ponder
January 2008, Communications in agricultural and applied biological sciences,
Copied contents to your clipboard!