ABSTRACT: Leaf age as a risk factor in contamination of lettuce with Escherichia coli O157:H7 and Salmonella enterica - (Applied and Environmental Microbiology)
April 9, 2008 – 8:07 pmhttp://aem.asm.org/cgi/content/abstract/74/8/2298?etoc
Outbreaks of Escherichia coli O157:H7 infections have been linked increasingly to leafy greens, particularly to lettuce. We present here the first evidence that this enteric pathogen can multiply on the leaves of romaine lettuce plants. The increases in population size of E. coli O157:H7 in the phyllosphere of young lettuce plants ranged from 16- to 100-fold under conditions of warm temperature and the presence of free water on the leaves and varied significantly with leaf age. The population size was consistently ca.
10-fold higher on the young (inner) leaves than on the middle leaves. The growth rates of Salmonella enterica and of the natural bacterial microflora were similarly leaf age dependent. Both enteric pathogens also achieved higher population sizes on young leaves than on middle leaves harvested from mature lettuce heads, suggesting that leaf age affects preharvest as well as postharvest colonization. Elemental analysis of the exudates collected from the […]
MORE:
http://www.extension.iastate.edu/foodsafety/news/fsnews.cfm?newsid=25308
Related posts:
ABSTRACT: Impact of vacuum cooling on Escherichia coli O157:H7 infiltration into lettuce tissue - (Applied and Environmental Microbiology, May 2008, p. 31383142 Vol. 74, No. 10)
ABSTRACT: Irradiation compared with chlorination for elimination of Escherichia coli O157:H7 internalized in lettuce leaves: influence of lettuce variety - (Journal of Food Science)
Transfer of Escherichia coli O157:H7 to romaine lettuce due to contact water from melting ice - (Journal of Food Protection)
High-Pressure resistance variation of Escherichia coli O157:H7 strains and Salmonella serovars in tryptic soy broth, distilled water, and fruit juice - (Journal of Food Protection (Volume 70, Number 9, pp. 2078-2083))
ABSTRACT: Potential application of high hydrostatic pressure to eliminate Escherichia coli O157:H7 on alfalfa sprouted seeds - (International Journal of Food Microbiology, Volume 128, Issue 2, 10 December 2008, Pages 348-353)
ABSTRACT: Efficacy of pulsed UV-light for the decontamination of Escherichia coli O157:H7 and salmonella spp. on raspberries and strawberries - (Journal of Food Science, OnlineEarly Articles)
An outbreak of Escherichia coli O157:H7 infection in southern Sweden associated with consumption of fermented sausage; aspects of sausage production that increase the risk of contamination - (Cambridge Journals)
Relative efficacy of sodium hypochlorite wash versus irradiation to inactivate Escherichia coli O157:H7 internalized in leaves of romaine lettuce and baby spinach - (Journal of Food Protection®)
ABSTRACT: Evaluation of chlorine, benzalkonium chloride and lactic acid as sanitizers for reducing Escherichia coli O157:H7 and Yersinia enterocolitica on fresh vegetables - (Food Control (Volume 20, Issue 3, March 2009, Pages 262-268))
Number of Salmonella on chicken breast filet at retail level and its implications for public health risk - (Journal of Food Protection (Volume 70, Number 9, pp. 2045-2055))
ABSTRACT: Efficacy of pulsed UV-light for the decontamination of Escherichia coli O157:H7 and Salmonella spp. on raspberries and strawberries - (Journal of Food Science)
Protecting Romaine lettuce from pathogens - (Agricultural Research Service, USDA)
ABSTRACT: Effect of selected plant essential oils or their constituents and modified atmosphere packaging on the radiosensitivity of Escherichia coli O157:H7 and Salmonella typhi in ground beef - (Journal of Food Protection)
Inactivation kinetics of inoculated Escherichia coli O157:H7, Listeria monocytogenes and Salmonella Poona on whole cantaloupe by chlorine dioxide gasstar, open - (Food Microbiology Volume 25, Issue 7)
ABSTRACT: Outbreak of Escherichia coli O157:H7 associated with raw milk consumption in the Pacific Northwest - (Foodborne Pathogens and Disease Volume: 5, Number: 3 Jun 2008)
Animal and environmental impact on the presence and distribution of Salmonella and Escherichia coli in hydroponic tomato greenhouses - (Journal of Food Protection®, Volume 71, Number 4, April 2008 , pp. 676-683(8))
Preparation-free method for detecting Escherichia coli O157:H7 in the presence of spinach, spring lettuce mix, and ground beef particulates - (Journal of Food Protection®, Volume 70, Number 11, November 2007 , pp. 2651-2655(5))
ABSTRACT: Comparative effect of direct-fed microbials on fecal shedding of Escherichia coli O157:H7 and salmonella in naturally infected feedlot cattle - (Journal of Food Protection)
Salmonella strains in humans distinct from animals - (from a press release)
CALIFORNIA Department of Health environmental investigation of E. coli O157:H7 outbreak associated with Taco Bell restaurants in the Northeastern states in 2006 - two California lettuce growers possibly implicated - (Marler Blog)
ABSTRACT: Evaluation of Escherichia coli O157:H7 internationalization into romaine lettuce tissues and detection of metabolic changes of internalized bacteria in response to bioavailable carbon using developed bioluminescent assay - (Purdue University)
Variation in virulence among clades of Escherichia coli O157:H7 associated with disease outbreaks - (Proceedings of the National Academy of Sciences (PNAS) Vol. 105, No. 12)
BSTRACT: Effect of acidified sodium chlorite, chlorine, and acidic electrolyzed water on Escherichia coli O157:H7, Salmonella, and Listeria monocytogenes inoculated onto leafy greens - (Journal of Food Protection)
ABSTRACT: Inactivation of Salmonella enterica serovar senftenberg 775W in liquid whole egg by ultrahigh pressure homogenization - (Journal of Food Protection, Volume 71, Number 11, pp. 2283-2288(6))
High pressures in combination with antimicrobials to reduce Escherichia coli O157:H7 and Salmonella agona in apple juice and orange juice - (Journal of Food Protection®, Volume 71, Number 4, April 2008 , pp. 820-824(5))
ABSTRACT: Effect of environmental factors and cell physiological state on Pulsed Electric Fields resistance and repair capacity of various strains of Escherichia coli - (International Journal of Food Microbiology Volume 124, Issue 3)
Health Hazard Alert- Dole brand hearts delight lettuce salad may contain E. coli O157:H7 bacteria– corrected (again) - (WebMaster CFIA)
CFIA: Health Hazard Alert - Dole Brand Hearts Delight Lettuce salad may contain E. coli O157:H7 bacteria - (from a press release)
Death of Salmonella serovars, Escherichia coli O157:H7, Staphylococcus aureus and Listeria monocytogenes during the drying of meat: A case study using biltong and droewors - (Journal of Food Safety Vol. 28, Issue 2)
Hot water treatments to inactivate Escherichia coli O157:H7 and Salmonella in Mung bean seeds - (Journal of Food Protection®, Volume 71, Number 4, April 2008 , pp. 830-834(5))
Survival of Escherichia coli O157:H7, Salmonella, and Listeria monocytogenes in cranberry juice concentrates at different °Brix levels - (Journal of Food Protection (Volume 70, Number 9, pp. 2072-2077))
SALINAS VALLEY: Dole: E. coli may be from here - (The Salinas Californian)
BARFBLOG: Dole lettuce from U.S. found with E. coli O157:H7 in CANADA - (barblog)
Association of prophage antiterminator Q alleles and susceptibility to food-processing treatments applied to Escherichia coli O157 in laboratory media - (Journal of Food Protection®, Volume 70, Number 11, November 2007 , pp. 2617-2619(3))
Evaluation of nonpathogenic surrogate bacteria as process validation indicators for Salmonella enterica for selected antimicrobial treatments, cold storage, and fermentation in meat - (Journal of Food Protection®, Volume 71, Number 4, April 2008 , pp. 714-718(5))
ABSTRACT: Salmonella prevalence in seafood mported into Japan - (Journal of Food Protection, Volume 71, Number 7, July 2008 , pp. 1460-1464(5))
ABSTRACT: A two-dose regimen of a vaccine against Escherichia coli O157:H7 type III secreted proteins reduced environmental transmission of the agent in a large-scale commercial beef feedlot clinical trial - (Foodborne Pathogens and Disease, Vol 5, No 5)
US: Fresh-cut lettuce in modified atmosphere packages stored at improper temperatures supports enterohemorrhagic E. coli isolates to survive gastric acid challenge - (Blackwell Synergy)
Microbial survey of selected Ontario-grown fresh fruits and vegetables - (Journal of Food Protection)
Determination of 5-Log reduction times for food pathogens in acidified cucumbers during storage at 10 and 25°C - (Journal of Food Protection®, Volume 70, Number 11, November 2007 , pp. 2638-2641(4))
CALIFORNIA: Two lettuces used in recalled salads came from Salinas Valley - (The Salinas Californian)
Child care-associated outbreak of Escherichia coli O157:H7 and hemolytic uremic syndrome 23.oct.07 - (Pediatric Infectious Disease Journal. 26(10):951-953, October 2007)
ABSTRACT: A large Escherichia coli O157 outbreak in SWEDEN associated with locally produced lettuce - (Foodborne Pathogens and Disease Volume: 5, Number: 3 Jun 2008)
Escherichia coli O157:H7 in Feral swine near spinach fields and cattle, central CALIFORNIA coast - (Emerging Infectious Diseases, Center for Disease Control)
ABSTRACT: Inhibition of Escherichia coli O157:H7 in ripening dry fermented sausage by ground yellow mustard - (Journal of Food Protection)
ABSTRACT: Molecular epidemiological analysis and microbial source tracking of Salmonella enterica serovars in a preharvest turkey production environment - (Journal of Foodborne Pathogens and Disease 5(2): 115-126)
A study of invasiveness of different Salmonella serovars based on analysis of the Enter-net database - (Eurosurveillance)
Association of farm management practices with risk of Escherichia coli contamination in pre-harvest produce grown in Minnesota and Wisconsin - (International Journal of Food )
Prevalence of Escherichia coli O157:H7 in the AMERICAN bison (Bison bison) - (Journal of Food Protection®)
ABSTRACT: Prevalence, genetic characterization and antimicrobial resistance of Salmonella isolated from fresh pork sausages in Porto Alegre, Brazil - (Food Control (Volume 20, Issue 3, March 2009, Pages 191-195))
ABSTRACT: Changes in the proteome of Escherichia coli during growth at 15 °C after incubation at 2, 6 or 8 °C for 4 days - (International Journal of Food Microbiology Volume 124, Issue 3)
ABSTRACT: Effect of storage in juice with or without pulp and/or calcium lactate on the subsequent survival of Escherichia coli O157:H7 in simulated gastric fluid - (Journal of Food Microbiology, Volume 123, Issue 3)
ABSTRACT: Determination of Norovirus contamination in oysters from two commercial harvesting areas over an extended period, using semiquantitative real-time reverse transcription PCR - (Journal of Food Protection, Volume 71, Number 7, July 2008 , pp. 1427-1433(7))
CANADA: Pathway to virulence uncovered in salmonella - (The Poultry Site)
ABSTRACT: Development of TiO2 powder-coated food packaging film and its ability to inactivate Escherichia coli in vitro and in actual tests - (Journal of Food Microbiology, Volume 123, Issue 3)
Risk profiles of pork and poultry meat and risk ratings of various pathogen/product combinations - (International Journal of Food Microbiolgy (Volume 126, Issues 1-2, Pages 1-262))
Pulsed-p lasma gas-discharge inactivation of microbial pathogens in chilled poultry wash water - (Journal of Food Protection)
Antimicrobial efficacy of eugenol microemulsions in milk against Listeria monocytogenes and Escherichia coli O157:H7 - (Journal of Food Protection®, Volume 70, Number 11, November 2007 , pp. 2631-2637(7))
BLOG: Move makes food safer - (USA Today)
Efficacy of dose regimen and observation of herd immunity from a vaccine against Escherichia coli O157:H7 for feedlot cattle - (Journal of Food Protection®)
A comparison of cecal colonization of Salmonella enterica serotype Typhimurium in white leghorn chicks and Salmonella-resistant mice - (BMC Microbiology 2008, )
UK: New method could end lettuce contamination, say researchers - (Food Production Daily)
ABSTRACT: Evaluation of various antimicrobial interventions for the reduction of escherichia coli O157:H7 on bovine heads during processing - (Journal of Food Protection)
ARIZONA: UA researchers identify sources of food tainting - (Arizona Daily Wildcat)
ABSTRACT: Application of predictive modelling techniques in industry: From food design up to risk assessment - (International Journal of Food Microbiology (Volume 128, Issue 1, Pages 10-15 ))
ABSTRACT: Safety of raw meat and shellfish in Vietnam: An analysis of Escherichia coli isolations for antibiotic resistance and virulence genes - (International Journal of Food Microbiology Volume 124, Issue 3)
Inactivation of Escherichia coli O157:H7 in ground beef by single-cycle and multiple-cycle high-pressure treatments - (Journal of Food Protection®, Volume 71, Number 4, April 2008 , pp. 811-815(5))
Tips from the journals of the American Society for Microbiology - (American Society for Microbiology)
Inactivation of Escherichia coli JM109, DH5a, and O157:H7 suspended in Butterfield’s Phosphate Buffer by gamma irradiation - (Journal of Food Science (OnlineEarly Articles). )
ABSTRACT: Carvacrol and cinnamaldehyde facilitate thermal destruction of Escherichia coli O157:H7 in raw ground beef - (Journal of Food Protection)
ABSTRACT: Application of a transmission model to estimate Performance Objectives for Salmonella in the broiler supply chain - (International Journal for Food Microbiology (Volume 128, Issue 1, Pages 22-27 ))
The growing threat of foodborne bacterial enteropathogens of animal origin - (University of Chicago Press)
KANSAS: Food safety for fresh produce begins on the farm - (Kansas State University press release)
Antimicrobial effect of electrolyzed oxidizing water against Escherichia coli O157:H7 and Listeria monocytogenes on fresh strawberries - (Journal of Food Science)
ABSTRACT: Transcription analysis of stx1, marA, and eaeA genes in Escherichia coli O157:H7 treated with sodium benzoate - (Journal of Food Protection, Volume 71, Number 7, July 2008 , pp. 1469-1474(6))
Effect of a vaccine product containing type III secreted proteins on the probability of Escherichia coli O157:H7 fecal shedding and mucosal colonization in feedlot cattle - (Journal of Food Protection®, Volume 70, Number 11, November 2007 , pp. 2568-2577(10))
PARIS: Supplemental information on hamburgers contaminated by E. coli O157:H7 - (Ministere de l’Agriculture)
ONTARIO: Lettuce likely E. coli culprit: Ont. health officials - (Windsor Star)
ILLINOIS: How to avoid problems with produce - (News-Gazette.com)
ABSTRACT: Rapid FT-IR methods for detection of Escherichia coli O157:H7 in fruit juices - (Department of Food Science, Purdue University)
ABSTRACT: Antimicrobial effect of water-soluble muscadine seed extracts on Escherichia coli O157:H7 - (Journal of Food Protection, Volume 71, Number 7, July 2008 , pp. 1465-1468(4))
Water pressure effectively reduces Salmonella enterica Serovar enteritidis on the surface of raw almonds - (Journal of Food Protection®, Volume 71, Number 4, April 2008 , pp. 825-829(5))
Spinach-associated Escherichia coli O157:H7 outbreak, UTAH and NEW MEXICO, 2006 - (Emerging Infectious Diseases 2008 October)
ONTARIO: Third case of E. coli linked to U.S. lettuce - (Chatham Daily News)
ABSTRACT: Influence of selective media on successful detection of Shiga toxinproducing Escherichia coli in food, fecal, and environmental samples - (Foodborne Pathogens and Disease Volume: 5, Number: 3 Jun 2008)
First report of a Salmonella enterica serovar Weltevreden outbreak on Réunion Island, FRANCE, August 2007 - (Eurosurveillance, Volume 13, Issue 32)
ABSTRACT: Evaluation of the Premi®Test Salmonella, a commercial low-density DNA microarray system intended for routine identification and typing of Salmonella enterica - (Journal of Food Microbiology, Volume 123, Issue 3)
KANSAS: Feeding DDGs does not increase E. coli prevalence - (Feedstuffs.com)
ABSTRACT: Study on presence/absence of central nervous tissues as BSE specified risk material in processed and raw meat products in Japan - (Food Control (Volume 20, Issue 3, March 2009, Pages 187-190))
Society for Applied Microbiology Spring Meeting
Listeria monocytogenes and Escherichia coli O157:H7 inhibition in vitro by liposome-encapsulated nisin and ethylene diaminetetraacetic acid - (Journal of Food Safety Vol. 28, Issue 2)
ABSTRACT: Bacteriological profile of raw, frozen chicken nuggets - (Journal of Food Protection)
US: Influence of autoinducer-2 (AI-2) and beef sample extracts on E. coli O157:H7 survival and gene expression of virulence genes yadK and hhA - (Blackwell Synergy)
ABSTRACT: Inactivation of Salmonella, E. coli and Listeria monocytogenes in phosphate-buffered saline and apple juice by ultraviolet and heat treatments - (Food Control (Volume 20, Issue 4, Pages 443-446))
CANADA: Zero risk,’ Maple Leaf Food says - (Globe and Mail)
Occurrence and characterization of Salmonella from chicken nuggets, strips, and pelleted broiler feed - (Journal of Food Protection®, Volume 70, Number 10, October 2007 , pp. 2251-2258(8))
Reduce microwave oven power output boosts food poisoning risk - (Sask Pork and Manitoba Pork Council)
US: FDA food safety plan taps others for inspection help - (CIDRAP)
UK: Company to offer pathogen detection kits directly to food safety testing market - (Spectroscopynow.com)
ABSTRACT: Contamination sources of coliforms in two different types of frozen ready-to-eat shrimps - (Food Control (Volume 20, Issue 3, March 2009, Pages 289-293))