Microbiological Performance of a Food Safety Management System in a Food Service Operation
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706 Journal of Food Protection, Vol. 75, No. 4, 2012, Pages 706–716 doi:10.4315/0362-028X.JFP-11-260 Copyright G, International Association for Food Protection Microbiological Performance of a Food Safety Management System in a Food Service Operation E. LAHOU,* L. JACXSENS, J. DAELMAN, F. VAN LANDEGHEM, AND M. UYTTENDAELE Department of Food Safety and Food Quality, Laboratory of Food Microbiology and Food Preservation, University of Ghent, Coupure Links, 653, 9000 Ghent, Belgium Downloaded from http://meridian.allenpress.com/jfp/article-pdf/75/4/706/1682672/0362-028x_jfp-11-260.pdf by guest on 02 October 2021 MS 11-260: Received 26 May 2011/Accepted 11 October 2011 ABSTRACT The microbiological performance of a food safety management system in a food service operation was measured using a microbiological assessment scheme as a vertical sampling plan throughout the production process, from raw materials to final product. The assessment scheme can give insight into the microbiological contamination and the variability of a production process and pinpoint bottlenecks in the food safety management system. Three production processes were evaluated: a high-risk sandwich production process (involving raw meat preparation), a medium-risk hot meal production process (starting from undercooked raw materials), and a low-risk hot meal production process (reheating in a bag). Microbial quality parameters, hygiene indicators, and relevant pathogens (Listeria monocytogenes, Salmonella, Bacillus cereus, and Escherichia coli O157) were in accordance with legal criteria and/or microbiological guidelines, suggesting that the food safety management system was effective. High levels of total aerobic bacteria (.3.9 log CFU/50 cm2) were noted occasionally on gloves of food handlers and on food contact surfaces, especially in high contamination areas (e.g., during handling of raw material, preparation room). Core control activities such as hand hygiene of personnel and cleaning and disinfection (especially in highly contaminated areas) were considered points of attention. The present sampling plan was used to produce an overall microbiological profile (snapshot) to validate the food safety management system in place. Some individuals tend to eat out of the home, often at because of a lack of a well-functioning food safety food service operations such as cafeterias, canteens, fast management system, are contaminated ingredients, dirty food outlets, bars, and restaurants (40, 56). A national food food contact materials, poor personnel hygiene practices, consumption survey in Belgium revealed that in 2004 more inappropriate storage temperatures, and insufficient cooking than 35% of the population consumed more than 25% of (17, 29–31, 58). In food service operations, various types of their daily energy intake out of the home (34). Eating out at raw (at-risk) materials are used and a wide variety of final food service operations seems to be no longer reserved for products are served, including hot meals, cold sandwiches, special occasions. However, food service operations can be and salads. This multitude of products, processes, and involved in foodborne disease outbreaks associated with a personnel involved makes it very important to ensure safe variety of pathogens, e.g., Salmonella, Campylobacter spp., food service and to have a well-functioning food safety Escherichia coli O157, Listeria monocytogenes, Bacillus management system, as requested from all food business cereus, Clostridium perfringens, and Staphylococcus aureus operations in Regulation (EC) 852/2004 on the hygiene of (13, 14, 35). foodstuffs (1). The microbiological quality and safety of Kitchens with a history of association with foodborne foods is largely affected by the performance of the food outbreaks or consumer complaints about food safety issues safety management system (26, 27). The application of good have significantly more frequent problems with personnel manufacturing practices and good hygiene practices as parts hygiene and inadequate raw material storage than do other of a hazard analysis critical control point (HACCP) plan and kitchens (53). Food handlers were epidemiologically linked the use of ISO (International Organization for Standardiza- to 80% of the norovirus outbreaks reported in Belgium (9). tion, Geneva, Switzerland) method 9001:2008 can improve Food handlers’ malpractices contributed to 97% of product quality and safety (32, 33). Periodic verification of foodborne illnesses associated with food service operations the HACCP plan is recommended. (59). Adequate process controls and periodic verification are The main causes of microbiological contamination and more effective than control of only final products (44). growth, which occur in food service operations mainly Swanson and Anderson (51) stated that testing of final products is equivalent to finding a needle in a haystack, * Author for correspondence. Tel: (z32) 09-2649390; Fax: (z32) 09- particularly in food service operations where a wide variety 2255510; E-mail: [email protected]. of final products are generated as output for the consumers. J. Food Prot., Vol. 75, No. 4 MICROBIAL PERFORMANCE IN INSTITUTIONAL CATERING 707 Moreover, sampling and microbiological analysis often are bags (no postprocessing contamination can occur) (process C). The perceived as costly. main difference between process B and process C was the A microbiological assessment scheme (MAS) devel- utilization of raw material in process B with its overall higher oped by Jacxsens et al. (26) includes minimal sampling and microbiological load and higher risk of pathogen contamination. analysis, but uses a systematic approach to assess the MAS. The MAS was developed as described by Jacxsens et microbiological performance of a company-specific food al. (26) and applied vertically throughout a production process. The safety management system (26). This sampling plan, when MAS (i) identifies critical sampling locations within the production accompanied by observations at the time of sampling and process, (ii) selects appropriate microbiological parameters to be discussion of results with the quality manager of the analyzed, (iii) defines the sampling procedures and analytical company, provides an overview of the microbiological methods, and (iv) helps in the interpretation of the results. Samples quality, hygiene, and safety level of products and processes were collected at various critical locations in the process A, B, and at a food business operation. Such information may help C processing lines from raw materials to final products and then managers identify bottlenecks in the core control activities analyzed to assess the microbiological performance of the core of an implemented food safety management system (37, 45). control activities in the implemented food safety management Downloaded from http://meridian.allenpress.com/jfp/article-pdf/75/4/706/1682672/0362-028x_jfp-11-260.pdf by guest on 02 October 2021 With this approach, samples are collected throughout the system. The same samples were collected and analyzed for the process from raw materials to final products at critical same parameters during three visits on three days in one restaurant of the food service operation to provide information on the locations on three different days (in a time period of maximum load and the distribution of the microbiological load at multiple weeks) and analyzed for multiple microbiological each sampling location in the production process. The visits took parameters. A microbiological profile of the production place in March 2009, February 2010, and March 2010. During process then can be established. each visit, 33 samples were collected and analyzed (Table 1). This The microbiological analyses to assess the food safety resulted in a total of 99 samples throughout the survey: 36 food management system performance are aimed at obtaining samples, 21 swabs for detection of L. monocytogenes, and 42 contamination profiles, which provide insight into the swabs for enumeration of hygiene indicators and determination of maximum microbiological counts and the distribution of the total viable bacteria count (TVC). A total of 147 analyses of the microbiological contamination. The sample analysis is quality parameters, 216 analyses of hygiene indicators, and 132 not meant as a guarantee of food safety but rather provides analyses of foodborne pathogens were performed. The number of verification of the preventive measures taken in the food samples was small, but they were collected as part of a periodic verification of the preventive measures implemented in the food service operation. The principle of the MAS is that a better service operation rather than as indicators of food safety. performing food safety management system would be better Samples were collected within the production processes on able to realize products with lower contamination levels and locations where loss of control will lead to unacceptable food less variation in contamination loads. MASs already have safety problems due to contamination with or growth and/or been applied in poultry meat preparation processing plants survival of microorganisms (26). Those locations are referred to (45), a pork processing company (26), the lamb chain (42), critical sampling locations (CSLs) and are illustrated in Figure 1. and various dairy and meat processing plants in Europe In this study seven CSLs were identified. Samples were collected (27). In the present study, a MAS was developed for a food