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Doug Powell

  • Posted: February 11th, 2012 - 4:57am by Doug Powell

    I’ve got some work in Dubai and inexplicably scored access to the Emirates fancy pants lounge at the Brisbane airport. So I wore shorts. Fabulous beef, fruit, and I’m drinking Veuve Cliquot champagne (which I usually pronounce Verve Cluque) like Dan Aykroyd in the Blues Brothers.

    But proving once again that even the fanciest places may not know much about food safety, this delightfully refreshing and crisp prawn salad was tainted with sprouts Raw pea sprouts. Yuck. Besides direct ingestion there is cross-contamination.

    A table of sprout-related outbreaks is available at http://bites.ksu.edu/sprouts-associated-outbreaks.

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  • Posted: February 11th, 2012 - 1:00am by Doug Powell

    Last week, some 300 staff and students in San Francisco were sickened with norovirus believed to have been transmitted by someone barfing on a door handle.

    It now appears a similar mode of transmission sickened 229 cheerleaders and cheeries at a Washington state competition.

    JoNel Aleccia of msnbc cites Suzanne Pate, spokeswoman for the Snohomish Health District, as confirming Friday that norovirus was the cause, and the outbreak was likely precipitated by people who were ill in public.

    "Somebody arrived at the event sick," said Pate, noting that janitorial crews were called to clean up vomit in a restroom and on an adjacent walkway. Those areas were likely exposure sites for the cheer and dance teams, she said.

    Some 229 people were sickened and least 33 people sought medical attention for their illnesses, state health officials said late Friday. That number is expected to grow as the investigation continues.

    A Comcast Arena spokeswoman said officials had sanitized the premises in accordance with federal health guidelines before a new event scheduled for Friday night. Tests of the arena's water supply showed no problems, Pate said.

    "It's probably the best-scrubbed place in the county," she added.

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  • Posted: February 11th, 2012 - 12:27am by Doug Powell

    I don’t watch American Idol; I saw enough of Steven Tyler performing half-time at the Super Bowl. But I pay attention when my health-type friends tell me, the contestants on American Idol this week suffered from Idol Flu, with many gratuitous vomit shots, lots of hugging and no handwashing in sight.

    Amy (Tent Girl) Brumfield earned a new nickname -- Patient Zero. She brought a stomach bug to Hollywood with her, and, soon, practically every group has to carry their own plastic bag with them, just in case somebody loses their dinner.

    A few of the more promising singers -- Johnny Keyser, David Leathers Jr. and Deandre Brackensick -- looked like they've got their acts together. But this Group Night show featured as much drama, and as much retching, as it did actual singing.

    Maybe it was norovirus; maybe the barfing contestants were forced to watch their own show.

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  • Posted: February 10th, 2012 - 1:42pm by Doug Powell

    Most of the 100-plus people infected with norovirus last month had eaten at a local Subway franchise.

    The Star Press reports an investigation by the Blackford County Health Department (that’s in Indiana) was unable to determine whether a customer or an employee spread the virus, also known as a stomach bug and food poisoning.

    "We don't know how it bounced in there," said Linda Briles, an environmental health specialist at the department. "We may never know. I use the term 'bounced in there,' either www.barfblog.com/blog/152553/12/01/14/eat-fresh-90-sick-norovirus-linked-indiana-subwaywith an employee or a customer, I don't know. But it bounced in and went from there."

    She said the virus could have been spread by a customer who failed to properly wash his or her hands after using the restroom. "A customer could have left it on a door knob," Briles said. "It (transmission) is fecal-oral. Or an employee could have caused it by poor hand washing."

    An outbreak investigation report from the state department of health won't be completed for several months, spokeswoman Amanda Turney said. A state epidemiologist will conduct a "hot wash" meeting today with the county health department staff to identify lessons learned from the outbreak.

    "I want to do a final hot wash before I release my report (of the investigation to the public)," Briles said. "It should be available after I get down to the state health department and have it checked by the media (relations office)."

    Briles said tests showed that more than one Subway employee was infected with the norovirus. "They were sick the same time everyone else was," Briles said. To her knowledge, the infected employees were not sick before the outbreak.

    There has been an Indiana administrative code regulating food workers with diagnosed illnesses since 2000, but it wasn't being enforced in Indiana until 2008.

    Under the code, any food employee who is diagnosed with one of the following illnesses must be excluded from the food establishment: salmonella, shiga toxin-producing E. coli, shigella, hepatitis A or norovirus.

    From company headquarters in Milford, Conn., Subway public relations manager Kevin Kane said, "Upon learning of the norovirus investigation by the Blackford County Health Department, the franchisee in Hartford City voluntarily closed the restaurant and had an independent company come in to thoroughly clean and sanitize the restaurant. This was in addition to the stringent cleaning and sanitizing procedures practiced here on a daily basis.

    Despite hiring an independent contractor to sanitize the restaurant, Subway was cited by Briles for mold, dirty floors and other violations after re-opening.

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  • Posted: February 10th, 2012 - 1:24pm by Doug Powell

    While assuring the public that there is no evidence of an outbreak, the Central District Health Department is alerting the public that an employee of the Cheesecake Factory on North Milwuakee Road in Boise, Idaho, was infected with the hepatitis A virus, but is no longer infectious.

    CDHD is alerting patrons who may have dined at the restaurant between Dec. 13, 2011, and Jan. 22, 2012, that they may have been exposed to hepatitis A. If a person has had a hepatitits A vaccine or have had the illness in the past, the CDHD said they are protected from the infection.

    "The risk to the public health is extremely low because the employee was not involved in food preparation," said a statement from CDHD. "Still, there is the possibility that patrons could have been exposed to hepatitis A."

    The Cheesecake Factory has fully cooperated with the investigation into the situation. The employee is believed to have practiced good hand hygiene. The risk of exposure is considered very small, but not zero.

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  • Posted: February 10th, 2012 - 1:04pm by Doug Powell

    Nearly 200 people across the state have reported illnesses after attending a high school cheer and dance event in Everett earlier this month.

    Preliminary survey results show at least 192 reports of illness from participants and adults who attended the event Feb. 4. Students and adults from Columbia River and Skyview high schools in Vancouver attended the event.

    The Washington State Department of Health is investigating the cause of the outbreak.

    As part of the investigation, questionnaires were sent to participants and their families and stool samples are being collected for testing at the state Public Health Laboratories.

    More than 3,000 people attended the event and more than 1,000 competed in the State Cheerleading and Salute to Spirit in cheer and dance/drill.

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  • Posted: February 10th, 2012 - 12:52pm by Doug Powell

    In a triumph of food porn over food safety, an investigation into an outbreak of salmonellosis in the summer of 2010 after a wedding party in Bavaria, Germany that sickened at least 52 people failed to pinpoint a specific food source but did uncover a number of disturbing food safety practices – such as adding rose petals to food and no temperature checks -- again linked to an unlicensed caterer.

    German researchers report in Eurosurveillance this week that in the summer of 2010, a local health office in northern Bavaria, Germany, was informed that approximately half of the 110 guests of a wedding that had taken place the preceding weekend had contracted gastroenteritis. At the wedding party, soup and a late-lunch buffet (served from 3 p.m.) and a cold dinner buffet (served from 10 p.m.) had been provided by an out-of-town caterer. In addition, a wedding cake made by a local bakery and a number of cakes and desserts contributed by different wedding guests were served by the catering staff at 20.00. The food served at the wedding was suspected to be the source of the outbreak. Initial laboratory results of stool samples of some guests who became ill indicated Salmonella enterica subsp. enterica serovar Enteritidis (S. Enteritidis) as the causative pathogen.

    According to the caterer, only the meat dishes were prepared at the caterer’s facilities in advance. All sauces, antipasti and salads were made from commercially produced ingredients and were prepared at the wedding party venue. Food items that required cooling were transported in cooling boxes and stored in cooling units at the venue. At the venue, the lunch buffet was set up for six hours, between 2 p.m. (the buffet was set up one hour before it was available to guests) and 8 p.m. No checks were carried out of holding temperatures of the warm or cold dishes. Salads and other cold dishes were not cooled during this period. Photographs of the buffet showed that a number of the cold dishes were decorated with non-edible flowers (such as roses), which were inserted into the food. The flowers had been purchased at a wholesale retailer. Cakes supplied by a number of wedding guests were stored without cooling until they were served at 20:00. The dishes of the dinner buffet were not cooled. They were first served at 10 p.m. It is unclear for how long the dishes of the dinner buffet were served; however, it is known that the catering personnel departed at 00.30.

    Inspection of the catering facilities and interview of the catering staff revealed a number of shortcomings contravening European food hygiene regulations. The facilities used by the caterer were not registered with the local authorities. There were no records of the required staff training on food hygiene. No temperature controls of cooling devices or transport boxes were carried out, nor were temperatures monitored during preparation or serving of warm dishes. There were no records of HACCP concept planning or implementation. The company was banned from catering until proof of changes in their practices had been provided to the local authorities.

    The cohort study showed that a variety of dishes were associated with a significantly increased risk of infection: in particular consumption of a group of lunch dishes containing mayonnaise was associated with a high relative risk. Despite the constraint of a two-week delay between the wedding party and the questionnaires being sent out, participants appeared to recollect well which dishes they had consumed.

    The isolation of S. Enteritidis from two of the food samples at the wedding party was judged to show that the food served posed a health risk, as all the food items were ready for consumption without requiring further preparation or heating. The isolation of indistinguishable Salmonella strains from the food samples as well as from stool samples of respondents and catering personnel supported the hypothesis that the outbreak was foodborne.

    There are several possibilities for the source of the Salmonella contamination in this outbreak. Mayonnaise is a well-recognized vehicle of contamination when raw egg is used as an ingredient. However, in this outbreak all cold dishes and salads were made from commercially prepared ingredients. As commercially produced mayonnaise and sauces are conventionally based on pasteurized ingredients, it is unlikely that they would be the primary source of contamination. Commercial mayonnaise by itself is also not suitable for Salmonella propagation, due to its low pH adjusted by acetic acid. However, addition of mayonnaise to other salad ingredients may alter the overall acetic acid concentration of the mixture, thus providing a suitable base for proliferation once the pathogen has been introduced by secondary contamination.

    The environmental investigation revealed a number of infringements of food safety regulations, including a lack of staff training and the absence of records of a food safety concept according to the HACCP principles. Lack of temperature controls for food storage and transport as well as prolonged presentation of buffet dishes at room temperature provided ideal conditions for pathogen proliferation, regardless of the primary source of contamination.

    While they do not replace official controls, the HACCP principles are central to the European concept of food safety by helping food business operators to attain a high standard of food safety. Successful implementation of procedures based on the HACCP principles requires the full cooperation and commitment of food business employees. Adequate training of personnel is central to achieving this goal.

    The outbreak investigated in this study demonstrates the consequences of lack of staff training and the failure to identify hazards to food safety, as well as failure to implement control measures to mitigate such hazards. The use of flowers as food decoration demonstrated insufficient understanding of the potential for contamination through products that are not intended for food production and therefore not subject to food hygiene regulations.

    Intelligently implemented food hygiene concepts not only benefit the consumer but are also very much in the interest of the food business operator, whose business can be threatened by food-borne outbreaks. Initial hygiene and food safety training for food business operators should therefore also explain microbiological principles underlying food safety practices in order to equip the businesses with the required background knowledge and motivation to design and implement an intelligent food safety/HACCP concept, including the consideration and identification of potential sources of contamination. Explicit mention of the dangers of the use of non-edible flowers for decoration should be considered in guides to good practice, which are a valuable instrument to aid food business operators with compliance with food hygiene rules and with the application of the HACCP principles.

    The complete paper is available at http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20076.

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  • Posted: February 9th, 2012 - 3:03am by Doug Powell

    If you’ve eaten at Gonzalez Restaurant, 8121 Bruton Road, in Dallas, between January 25-28, you may want to see a doctor.

    An employee who was diagnosed with hepatitis A went to work and may have come in contact with customers.

    Health-types are working to alert medical care providers to be on the lookout for any customers who may have been infected.

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  • Posted: February 9th, 2012 - 2:52am by Doug Powell

    Officials of a Mexican political party are apologizing to 650 indigenous people who suffered food poisoning after attending a campaign rally in southern Mexico.

    Authorities in the indigenous town of Chilapa had to open an auditorium on Wednesday to treat people who became sick after eating rice tacos and eggs handed out by former mayor Sergio Dolores, who is running for congress.

    Guerrero state civil protection officials said adults and children were fainting, throwing up and suffering from diarrhea.

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  • Posted: February 8th, 2012 - 11:26pm by Doug Powell

     I didn’t write the headline, but this is now running in the Toronto Star, regarding the article, Low blow from Loblaw boss gets farmers’ goat, Feb. 8.

    It’s not that a grocery mogul told the Canadian Food Summit that “one day, (farmers’ markets) are going to kill some people,” it’s that no one in the farmers’ market community responded with any kind of microbiological food safety comment, resorting instead to: trust us and we’re inspected.

    Robert Chorney, the executive director of Farmers' Markets Ontario, promoted a few food safety myths of his own, saying that markets are regularly inspected and food is easily traceable because consumers know who they're buying from.

    Inspections don’t mean much. And just because someone drives to the Food Terminal in Toronto to load up on produce at 3 a.m. and then sell it at a premium at the local market adds nothing to traceability.

    Pointing to surveys showing consumers think food at farmers’ markets is safer means nothing regarding the actual microbiological safety of any food. And surveys suck.

    When I go to a farmer’s market or a megalomarket run by the Westons, I ask questions about the quality of irrigation water, what kind of soil amendments are used, and employee handwashing programs. I ask about microbial test strategies and results as verification that the farmer, whether she bought it from the Food Terminal or grew it herself, has a clue about dangerous micro-organisms.

    Most answer with variations of trust me. There’s already enough faith-based food safety out there.

    I don’t care if it’s a farmers’ market or Loblaws: provide evidence that the food you’re flogging is microbiologically safe. The best producers and retailers will market food safety at retail.

    Regardless of size, production method or retail experience, providers either know about microbial food safety risks and take serious steps to control those risks — or they don’t.

    Dr. Douglas Powell, professor, food safety, Kansas State University

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  • Posted: February 8th, 2012 - 11:13pm by Doug Powell

    A new report says Canadians suffer more foodborne illness than Americans, that most of it happens with restaurant meals, and that consumers are sorta dumb too.

    Unfortunately, the report relies heavily on other reports that are not peer-reviewed, assumptions, and suffers from highly selective referencing to make a point – and I have no idea what that point is.

    The report, Improving Food Safety in Canada: Toward a More Risk Responsive System, released by the Conference Board of Canada to coincide with their food safety conference and upstaged by Galen Weston Jr.’s comments that farmer’s markets were going to kill someone, says half or more of all cases of foodborne illnesses in Canada are picked up in restaurants or from other food service providers.

    Daniel Munro, Principal Research Associate, said, “It is commonly assumed that farms and food processing companies hold the most responsibility for ensuring safe food, and their role is critical. But most foodborne illnesses are associated with the preparation and storage practices of restaurants, food service operations, and consumers themselves.”

    I’m not sure who makes that assumption. It is estimated there are 6.8 million cases of food-borne illness annually in Canada.

    Part of the problem can be traced to restaurant inspection systems that are seen as too sporadic to have an impact on restaurants’ day-to-day food safety practices.

    Garth Whyte, president and CEO of the Canadian Restaurant and Foodservices Association dismissed the report describing it as "shockingly short on facts."

    "This study did not even bother contacting us about what we are doing, and if they had, they would know that there are three government recognized food safety training programs that train tens of thousands food handlers per year," Whyte said.

    Except training alone doesn’t do much for food safety behavior.

    The report provides a number of recommendations to improve Canada’s food safety system including providing restaurants and other food service providers with timely information and advice on how they can minimize food safety risks.

    We call them infosheets.

    It also urges governments to build on current consumer awareness initiatives by engaging consumers directly in discussions about food safety in their households.

    The report offers no advice on how to do that.

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  • Posted: February 8th, 2012 - 10:58pm by Doug Powell

    The U.S. Food Safety and Inspection Service announced on Feb. 8 it is extending the implementation date for routine sampling of six additional shiga-toxin producing E. coli serogroups (O26, O45, O103, O111, O121 and O145) for 90 days, according to the North American Meat Processors Association. The date was extended from March 5 to June 4.

    NAMP says the extension was granted to give extra time to establishments so they could validate their test methods and detect these pathogens prior to entering the commerce stream.

    Initially, FSIS plans to sample raw beef manufacturing trimmings and other raw ground beef product components both imported and produced domestically, plus test the serogroups’ samples.

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  • Posted: February 8th, 2012 - 7:02pm by Doug Powell

    Norovirus is making the rounds in Madison, Wisconsin, with five food-related outbreaks since last November.

    Dane County health officials are still waiting for test results from the most recent outbreak. It took place Jan. 29 when at least 16 people had vomiting and diarrhea after eating sandwiches and other food at the Mandrake Road Church of Christ in Madison.

    Also last month, 28 people got sick after eating at Erin’s Snug Irish Pub in Madison. The other outbreaks took place at a drama-filming session at Madison West High School, the Pyle Center at U W Madison, and a Madison art show.

    Health department epidemiologist Amanda Kita-Yarbro says the five outbreaks in a three-month period are a first for her agency. She said it could have been spurred either by food workers or people attending the various events.

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  • Posted: February 8th, 2012 - 6:44am by Doug Powell

    loblaws.gif

    It’s not that a grocery mogul told a supposed food safety conference that “one day, (farmers’ markets) are going to kill somebody;” it’s that no one in the farmer’s market community responded with any kind of microbiological food safety comment, resorting instead to, trust us and we’re inspected.

    The Toronto Star reports mega-billionaire Galen-hey-now-Weston (right, exactly as shown), head of Canadian mega-grocer Loblaws, with over 1,000 stores, told the Canadian Food Summit yesterday, "Farmers' markets are great … One day they're going to kill some people, though. I'm just saying that to be dramatic, though.”

    Robert Chorney, the executive director of Farmers' Markets Ontario, responded, "We strenuously object" to Weston's remark. That was awful."

    Ontario's 175 farmers' markets do more than $700 million in sales every year. Chorney promoted a few food safety myths of his own, saying that markets are regularly inspected and food is easily traceable because consumers know who they're buying from.

    Inspections don’t mean much. And just because someone drives to the Food Terminal in Toronto to load up on produce at 3 a.m. and then sell it at a premium at the local market adds nothing to traceability.

    “The association said that four surveys since 1998 have shown that 83 per cent of respondents feel market food is as safe or safer than supermarket food.”

    Surveys suck; people’s perceptions often have no basis in reality.

    "A question for Galen Weston Jr: Have you ever been to a farmers' market?" tweeted Gail Gordon Oliver, publisher and editor of Edible Toronto. "Have you ever REALLY spoken to a farmer?"

    I have. And I ask questions. Like quality of irrigation water, what kind of shit soil amendments are used, and employee handwashing programs. I ask about microbial test strategies and results as verification that the farmer, whether she bought it from the Food Terminal or grew it herself, has a clue about dangerous microorganisms. Most answer with variations of, trust me.

    There’s already enough faith-based food safety out there.

    “Some delegates whispered among themselves on coffee breaks that supermarkets sell most of the food that's recalled by the Canadian Food Inspection Agency (CFIA).”

    That's because supermarkets sell most of the food that is consumed in Canada.

    “Farmers' Markets Ontario works with Ontario's 36 public health units, each of which has a champion responsible for markets. It has a food safety manual on its website.”

    A manual? Awesome, my faith is restored.

    I don’t care if it’s a farmer’s market or the Loblaws megalomart: provide evidence that the food you’re flogging is microbiologically safe. The best producers and retailers will market food safety at retail. People want it, that’s one reason they go to markets and buy all sorts of weird categories of food, but it’s not safer; it’s hucksterism.

    And being a big company like Maple Leaf of 2008 listeria-in-cold-cuts fame that killed 23 Canadians is no guarantee or even hint that microbiological food safety matters. Regardless of size, or production method, or retail experience, providers either know about microbial food safety risks and take serious steps to control those risks – or they don’t.

    In the 1990s as outbreaks were increasingly associated with unpasteurized apple cider, I would ask my cider provider at the Guelph local market (that’s in Canada) what he was doing to ensure the microbiological safety of his product. He could recite a variety of measures taken on the farm, and even set up a modest micro lab on the farm for testing. I bought his cider.

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  • Posted: February 8th, 2012 - 3:28am by Doug Powell

    Dozens of cheerleaders are suffering from vomiting and diarrhea after attending a Washington-state tournament in Everett last week.

    The cause and source of the illness are unknown, officials said. So is the total number of people affected. However, the Washington State Department of Health has received calls from 19 cheerleading squads all reporting at least one person sick. More than 1,000 cheerleaders competed in the event at Everett's Comcast Arena and more than 3,000 spectators attended.

    The investigation being conducted jointly by the Washington State Department of Health and the Snohomish Health District. So far, it has included collecting samples for testing at a laboratory, and sending a questionnaire to participants.

    People who attended the event and have severe symptoms are advised to contact a health care provider.

     

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  • Posted: February 7th, 2012 - 10:25am by Doug Powell

    Author: 
    Doug Powell

    At least one person is sick, leading to a recall of finely ground beef sold at New Middleast Supermarket, Ottawa (that’s in Canada).

    The affected ground beef is a finely ground raw beef known to be used for Kebbeh. This product was sold on December 28 and 29, 2011 (darn timely recall) from the New Middleast Supermarket, 1755 Bank Street, Ottawa, ON. This product was likely served from the fresh meat counter in plastic bags wrapped with paper. The packages may not bear a label identifying store name and other information. Consumers are advised to contact the retailer if you are unsure as to whether you have the affected beef product stored in your home freezer.

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  • Posted: February 7th, 2012 - 10:24am by Doug Powell

    At least one person is sick, leading to a recall of finely ground beef sold at New Middleast Supermarket, Ottawa (that’s in Canada)

    The affected ground beef is a finely ground raw beef known to be used for Kebbeh. This product was sold on December 28 and 29, 2011 (darn timely recall( from the New Middleast Supermarket, 1755 Bank Street, Ottawa, ON. This product was likely served from the fresh meat counter in plastic bags wrapped with paper. The packages may not bear a label identifying store name and other information. Consumers are advised to contact the retailer if you are unsure as to whether you have the affected beef product stored in your home freezer.

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  • Posted: February 7th, 2012 - 3:28am by Doug Powell

    The Chicago Health Department has found critical food safety violations at the United Center, home of the Chicago Blackhawks and my personal hero, goaltender Tony Esposito, along with some basketball team.

    After a CBS 2 investigation, the city began inspecting food vendors at sports venues during games — something they had not done before.

    2 Investigator Pam Zekman has previously reported on the potentially dangerous food temperature violations at Wrigley Field, Soldier Field and U.S. Cellular Field.

    Now the results of inspections at the United Center are in and violations found at eight different concession stands resulted in the United Center getting an F, a failed inspection.

    The inspectors found 12 critical temperature violations similar to violations they found at other Chicago sports arenas.

    Food safety expert Kantha Shelke reviewed the inspection reports and was alarmed at the findings.

    “I’m surprised that the enterprises operating at United Center did not pay attention and follow the simplest rules of food safety.”

    Dr. Bechara Choucair, commissioner of the Chicago Department of Public Health,
    said the unannounced inspections on game day have proven to be valuable, adding, “I am very happy with this program. We’re going to continue operating under this policy in 2012.”

    Choucair added that with education of workers and continued spot inspections, they hope to end food temperature problems. All violations at the United Center were corrected at the time of the inspections.

    A full report of health inspection results at the United Center is available at http://chicago.cbslocal.com/inspection-report/.

    Note the Tony O jersey on the dude ordering at a game. Best goalie ever.

     

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  • Posted: February 7th, 2012 - 2:04am by Doug Powell

    Laboratory testing by the South Dakota Department of Health has identified Clostridium perfringens as the cause of the outbreak associated with the Pierre-Mitchell high school boys' basketball game held in Pierre, Jan. 31.

    KSFY ABC reports the investigation, which included voluntary questionnaires, implicated tacos as the source food of the outbreak; of those completing questionnaires, 75 per cent who ate the tacos reported becoming ill.

    The outbreak follows a similar C. perfringens outbreak in Las Vegas before Christmas in which ham was held at improper temperatures and inadequately reheated, sickening at least 21 people. As noted in the Las Vegas outbreak, the majority of C. perfringens outbreaks are often the results of improperly cooled food or food held at room temperature for extended periods.

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  • Posted: February 6th, 2012 - 11:26pm by Doug Powell

    Those supermarket loyalty cards helped pin down an outbreak of salmonella in sausage in France last year.

    Researchers reported in Eurosurveillance last week that an outbreak of the monophasic variant of Salmonella enterica serotype 4,[5],12:i:- occurred in November and December 2011 in France. Epidemiological investigation and food investigation with the help of supermarket loyalty cards suggested dried pork sausage from one producer as the most likely source of the outbreak. Despite the absence of positive food samples, control measures including withdrawal and recall were implemented.

    Between 31 October and 18 December (week 44 to week 50), a total of 337 cases of Salmonella enterica serotype 4,[5],12:i:- were identified. The median age was 10 years (range: 0–90 years) with about 30% of children under five. A majority of women were affected (female to male sex ratio: 1.22). Cases were reported throughout France.

    An epidemic of Salmonella enterica 4,[5],12:i:- was already observed about three months prior to this outbreak. Between 1 August and 9 October, 682 cases were reported (Figure 1), of whom 100 cases were interviewed at the time but no common vehicle of infection could be identified. In comparison, 212 cases with this serotype had been isolated during the same period in 2010.

    Epidemiological investigations pointed to a dried pork sausage purchased principally at supermarket chain A and consumed after week 44, 2011. Therefore purchases of pork delicatessen at supermarkets A and B up to four weeks prior to symptom onset were investigated by the DGAL using data recorded through supermarket loyalty cards.

    The use of the loyalty card from supermarket chain A was important to identify the vehicle of infection and the local producer involved in this outbreak. These cards are used more and more and prove helpful in the investigation of food-related outbreaks. Nevertheless we should keep in mind that they do not necessarily reflect the consumption of cases perfectly. For instance, the card may not be used systematically, the household can purchase foods in additional shops and markets for which they have no loyalty cards, many food products are consumed outside the household and not recorded on the card, and the central database of the supermarket does not always contain data on all foods sold such as foods directly purchased by the retailers. For these reasons the data have to be interpreted together with the results from epidemiological and microbiological investigations.

    That the producer and microbiological analysis did not find Salmonella does not exclude contamination. The limited number of samples and the processing of the food (especially salting and drying) reduce the likelihood of isolating the bacteria. Implementing checks earlier in the process (before salting and drying) and using additional methods of testing such as polymerase chain reaction (PCR) should be considered.

    This is the second described outbreak in France involving dried pork sausage, and indicates that this food item might be a likely vehicle of infection and further outbreaks in humans may be expected.

    Given the limitations to detect Salmonella in dried sausages, the ability of the standard reference method to detect of monophasic variant strains in dried sausages is questionable. Additional methods should be explored in order to improve monitoring protocols.

    The complete report is available at http://www.eurosurveillance.org/ViewArticle.aspx?ArticleId=20071.
     

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