microbial contamination of fruits and vegetables

microbial contamination of fruits and vegetables

microbial contamination of fruits and vegetables

microbial contamination of fruits and vegetables

  • microbial contamination of fruits and vegetables

  • microbial contamination of fruits and vegetables

    microbial contamination of fruits and vegetables

    Sanitary cold storage of RACs and fresh-cut produce is important to reduce the risk of microbial contamination and potential for subsequent growth. Thus, if pathogens are present when the surface integrity of the fruit or vegetable is broken, pathogen growth can occur and contamination may spread. Personnel who handle fresh produce and fresh-cut produce touch surfaces or equipment that are likely to be contaminated (e.g., floor, trash cans) and do not change gloves or follow other recommended procedures before handling product. 9 and 10). We recommend that signs be multilingual and posted in areas close to where the practice is performed. In the event of a firm-initiated recall, if a firm believes its product is adulterated or otherwise violates the Act, we request that the firm immediately notify the appropriate FDA district office and that the notification include: For further FDA guidance on recalls, see 21 CFR sections 7.40-7.59. Operations with poor management of human and other wastes in the field or packing facility can significantly increase the risk of contaminating produce. Therefore, operators should place a high priority on ensuring the use of agricultural and management practices that minimize the potential for direct or indirect contact between fecal material and fresh fruits and vegetables. However, industry associations, growers, and operators are encouraged to consider ways to provide this capability, where feasible. Consumption of fruit and vegetable products is commonly viewed as a potential risk factor for infection with enteropathogens such as Salmonella and Escherichia coli O157, with recent outbreaks linked to lettuce, spinach and tomatoes. We suggest cautious use of hollow structures, such as catwalk framework, table legs, conveyor rollers, and racks, because they may collect water and debris, and thus, harbor pathogens. Federal, state, or local animal protection requirements must also be considered. Agricultural water refers to water used in the growing environment (for example, field, vineyard, or orchard) for agronomic reasons. India is currently producing over 77 million tone fruits and over 150 million tone vegetables per year, and is one of the leading country in horticulture. Sanitize means to treat clean produce by a process that is effective in destroying or substantially reducing the numbers of microorganisms of public health concern, as well as other undesirable microorganisms, without adversely affecting the quality of the product or its safety for the consumer. In addition, the U.S. Code of Federal Regulations (CFR) Title 21, Section 110.10 (21 CFR 110.10) prescribes worker health and hygienic practices within the context of GMPs in the manufacturing, packing, or holding of human food. Improved Template Preparations for PCR-Based Assays for Detection of Food-Borne Bacterial Pathogens. The microorganisms most significant in fruit juices are the lactic acid bacteria (Lactobacillus, Leuconostoc), yeasts, and molds. Foodborne microbial pathogens associated with the consumption of fresh fruits and vegetables include Cyclospora cayetanensis, Escherichia coli O157:H7, hepatitis A virus, Listeria monocytogenes, Norovirus, Salmonella spp., and Shigella spp.(9). Where fresh and fresh-cut fruits and vegetables are exposed to open air, we recommend that air quality be monitored to ensure that it is of suitable quality. High levels of mold contamination are generally attributed to unsound fruit entering the processing plant. We recommend that fresh-cut processors consider using the following practices for their sanitation program: An example of such a schedule is included in Figure 4. 7 and 8). Analysis and Evaluation of Preventative Control Measures for the Control and Reduction/Elimination of Microbial Hazards on Fresh and Fresh-Cut Produce, Reducing Microbial Food Safety Hazards for Sprouted Seeds, Sampling and Microbial Testing of Spent Irrigation Water During Sprout Production, Guide to Minimize Microbial Food Safety Hazards in Fresh Fruits and Vegetables, Foodborne Pathogenic Microorganisms and Natural Toxins Handbook (Bad Bug Book), Produce & Plant Products Guidance Documents & Regulatory Information, Soft nylon brush and High Pressure Hose (when appropriate), Chlorine-Quaternary ammonium ("quat")-based cleaner, Once/Month Walls adjacent to processing equipment should be cleaned daily, Hard bristle broom (not straw), floor scrubbers, low pressure hose, Overhead pipes, electrical conduits, structural beams, Brush, bucket, high water pressure machine, Chlorine-alkaline detergent, quat or iodine based sanitizer, Becoming aware of practices used by your suppliers (i.e., growers, packers, coolers, transporters, etc. Principle 4. (Also, see section 2.0 below on training.). Personnel are used interchangeably for handling unprocessed produce and finished fresh-cut product. Good agricultural practices may include protecting surface waters, wells, and pump areas from uncontrolled livestock or wildlife access to limit the extent of fecal contamination. However, raw agricultural commodities (RACs), as defined in section 201(r) of the Federal Food, Drug, and Cosmetic Act (the Act), are not subject to the CGMP requirements by virtue of the exclusion in 21 CFR 110.19. 5 and 6). 16). Regardless of the method used, maintaining the quality of the wash water (see section 2.a. Contamination of these commodities with pathogens during growth, harvesting, storage, transportation, processing and handling might occur. Prevention of microbial contamination of fresh produce is favored over reliance on corrective actions once contamination has occurred. Typical sources of agricultural water include flowing surface waters from rivers, streams, irrigation ditches, open canals, impoundments (such as ponds, reservoirs, and lakes), wells, and municipal supplies. We recommend that the processing equipment be designed and constructed to be easy to clean and maintain and to avoid microbial contamination of the fresh-cut product. Potential sources of microbial contamination, Figure 6. If fresh produce is linked to an outbreak, current industry practices in the marketing and distribution systems, such as using recycled shipping crates and co-mingling during distribution or at retail, make a direct identification of the source of a product very difficult. Effect of Hurdle Approaches Using Conventional and Moderate Thermal Processing Technologies for Microbial Inactivation in Fruit and Vegetable Products. Clean these areas on a regularly scheduled and "as needed" basis and take steps to minimize free-floating dust and other airborne contaminants. In addition, much of the research on the composting of manure and application of manure to field crops has focused on the effects of different practices on soil fertility and crop quality. First, such records help ensure consistency of processing operations and end-product quality and safety. In a January 1997 radio address, President Clinton announced a Food Safety Initiative to improve the safety of the nation's food supply (Ref. It was showed that fruits and vegetable were contaminated with potential food borne pathogens with varying degree of antibiotic resistance thus suggesting that they could act as a vehicle for the dissemination of antibiotic resistant organisms as well as serve as a reservoir of food borne pathogens of public health significance. Measures might include physical barriers, such as ditches, mounds, grass/sod waterways, diversion berms, and vegetative buffer areas. To prevent fresh-cut produce from becoming contaminated by equipment or other structures in the facility, we recommend that employees be trained on proper cleaning and sanitizing steps within the processing areas. Some sectors of the produce industry use water containing antimicrobial chemicals to maintain water quality or minimize surface contamination. In addition, high concentrations of wildlife (such as deer or waterfowl in a field) may increase the potential for microbial contamination. Despite the benefits of fresh fruits and vegetables to healthy living, their contamination with pathogenic bacteria such . U.S. Food and Drug Administration When a worker in the processing area needs a bandage, we recommend that the firm consider using a bandage that is detectable by a metal detector if there is a metal detector in the processing line. Box 96456, Rm. doi: 10.1111/j.1750-3841.2011.02219.x. Therefore, it is critical that growers, packers, and shippers work with their partners in transportation, distribution, and retail to develop technologies that allow grower/packing facility identification to follow fresh produce from the grower to the retailer and consumer. FDAs recommendations regarding when employees should wash their hands are reflected in the following list, Changing disposable gloves whenever contamination is a possibility. Many factors may play a role in the incidence and reporting of foodborne illness outbreaks that implicate fresh produce, such as an aging population that is susceptible to foodborne illness, an increase in global trade, a more complex supply chain, improved surveillance and detection of foodborne illness, improvements in epidemiological investigation, and increasingly better methods to identify pathogens (Refs. Low growing crops that may be splashed with soil during irrigation or heavy rainfall are also at risk if pathogens in manure persist in the soil. Ensure good hygienic practices are followed by visitors to the farm, packing, or transport facilities whenever they come into contact with fresh produce. 2004. to identify the source of produce and software to assist retailers in providing more accurate traceback to the grower/packer level. It was developed in cooperation with experts from several Federal and state government agencies and the fresh produce industry. Toilet facilities should be properly located. Clean pallets, containers or bins before using to transport fresh produce. Using wash water of an appropriate temperature. We also recommend that buildings, fixtures, and equipment be maintained in a condition that will protect fresh-cut produce from potential microbial, chemical, and physical contamination. The objective of this study was to perform a systematic review of risk factors for contamination of fruits and vegetables with Listeria monocytogenes, Salmonella, and Escherichia coli O157:H7 at the preharvest level. Center for Food Safety and Applied Nutrition (CFSAN) Below is a list of the most common pathogens that may be transmitted through food and their associated symptoms. This helps reduce the incidence of workers in the field or outside packing areas relieving themselves elsewhere (such as in fields). 14). 1 This document has been prepared as guidance by the Food and Drug Administration (FDA) and the USDA. Brush washing is more effective than washing without brushes. An employee unfamiliar with the operation and microbial controls has been hired or assigned to work or clean equipment in the processing areas. Follow good manufacturing practices to minimize microbial contamination from processing water. 1. While water quality management may vary throughout all operations, packers should follow good manufacturing practices to minimize the potential for the introduction or spread of pathogens via processing water. In evaluating the recommendations in this guide that are most appropriate for reducing microbial hazards in their individual operations, growers, packers, and shippers should strive to establish practices that do not inadvertently increase other risks to the food supply or the environment (e.g., excessive packaging or improper use and disposal of antimicrobial chemicals). Such documentation can be helpful to the processor in several ways. Without accountability to ensure the process is working, the best attempts to minimize microbial food safety hazards in fresh fruits and vegetables are subject to failure. The OMB control number for this information collection is 0910-0609 (expires 10/31/2010). A wide range of communicable disease and infections may be transmitted by infected employees to consumers through food or food utensils. As such, the fresh produce industry is extraordinarily diverse and complex in the number of products produced, how the products are grown and handled, and the geographic areas from which these products are sourced. Wherever water comes in contact with fresh produce, its quality dictates the potential for pathogen contamination. A number of post harvest processes, such as hydrocooling, use of dump tanks, and flume transport utilize a high degree of water-to-produce contact. 2021 Dec 9;14:11786361211060736. doi: 10.1177/11786361211060736. Fate of enterohemorrhagic Escherichia coli O157:H7 in bovine feces. If the containers are stored outside, they should be cleaned and sanitized before being used to haul fresh produce. We recommend that restrooms not open directly into processing areas and doors be equipped with self-closing mechanisms or have a maze-type entrance/exit. Pathogen: a microorganism capable of causing human illness or injury. 38(Suppl 3): S115-120. -For some operations, a series of washes may be more effective than a single wash. For example, packers may consider using an initial wash treatment to remove the bulk of field soil from produce followed by additional washes and/or a sanitizing dip and a final fresh, clean water rinse. Water of inadequate quality has the potential to be a direct source of contamination and a vehicle for spreading localized contamination in the field, facility, or transportation environments. A total of 571 outbreaks were identified from 1980 to 2016, accounting for 72,855 infections and 173 deaths. The simple household processes are not very effective in the removal of pathogenic organisms and pesticides. The ability of pathogens to survive in the field environment has been well studied, leading to the implementation of guidelines such as the Safe Sludge Matrix, which aim to limit the likelihood of viable pathogens remaining at point-of-sale. Berries and other fruit need no more than a minute of boiling, but vegetables should typically be cooked until done unless being consumed raw, whereby they also need a minute. Adequate refrigeration, in conjunction with crop characteristics, such as pH, is an important safeguard against many pathogens. Once good agricultural and manufacturing practices are in place, it is important that the operator ensure that the process is working correctly. Damaged produce, soil, debris, and pests may all arrive with the produce when it is delivered to the facility. Covered storage and reducing nearby harborage, like tall grass and debris, may reduce the potential for recontamination. Consider practices to minimize the potential of recontaminating treated manure. 1, 2). You must give the EPA catalog number for the publication. We recommend the following practices regarding the water used in a processing facility: Complying with applicable Federal, State, and local requirements for water that contacts fresh-cut produce or food-contact surfaces, including water used to make ice. Active treatments include pasteurization, heat drying, anaerobic digestion, alkali stabilization, aerobic digestion, or combinations of these. A variety of treatments may be used to reduce pathogens in manure and other organic materials. Because refrigeration temperatures may not be maintained during distribution of the products or while they are held by retailers or consumers, we also recommend that controls be in place to either prevent increases in temperature, as feasible, or to alert the processor, retailer, or consumer that the product may not be safe to consume. Accountability at all levels of the agricultural environment (farm, packing facility, distribution center, and transport operation) is important to a successful food safety program. Although water may be a useful tool for reducing potential contamination, it may also introduce or spread contaminants. Transporters should be aware of temperature requirements for produce being hauled and avoid delivery of mixed loads with incompatible refrigeration requirements. These approaches assume that the bioaccessible fraction remains constant across soil total metal concentrations and . For example, in 1994, there was a community hepatitis A outbreak in New York among individuals who had consumed bakery foods (Ref. Final washing of fresh produce after cutting, slicing, shredding, and similar fresh-cut processes helps remove some of the cellular fluids that could serve as nutrients for microbial growth. We recommend that fresh-cut processors use practices to maximize the cleaning potential during these processes and to minimize the potential for cross-contamination. OSHA standards under 29 CFR 1910.141, subpart J, provide regulations relative to toilet facilities and other sanitation issues. The design, construction, use, and general cleanliness of equipment can help reduce the risk of cross contamination of produce. As with any type of packaging, we recommend that controls be put in place to ensure that the process of packaging the product and the packaging materials themselves do not cause the product to become contaminated. 3). Protecting the safety of the U.S. food supply requires a comprehensive and coordinated effort throughout the food production and transportation system. There are several important considerations to remember when using this guide. Manure storage and treatment sites should be situated as far as practicable from fresh produce production and handling areas. Journal of Environmental Health. If gloves are used, be sure they are used properly and do not become another vehicle for spreading pathogens. Collecting leachate allows the grower to control its disposal (e.g., on a vegetative grassway) or use (e.g., to control moisture during composting). All written comments should be identified with this document's docket number: FDA-2008-D-0108. Handwashing stations should be equipped with a basin, water, liquid soap, sanitary hand drying devices (such as disposable paper towels), and a waste container. Equipment maintenance jobs that may have an impact on food safety include changing water filters, maintaining refrigeration units, treating processing water, and calibrating equipment. In a fresh-cut processing operation, water quality changes as the water is used and, thus, maintaining the quality of processing water should be considered. PMC Operators are encouraged to seek additional advice from their state and local Departments of Public Health, Environment, Agriculture, extension services and Federal agencies. Microbial contamination or cross-contamination of fresh produce during pre-harvest and harvest activities may result from contact with soils, fertilizers, water, workers, and harvesting equipment. 6 thru 12). In response, per capita consumption data show that Americans are eating more fresh produce (Ref. In addition, the CFR prescribes current good manufacturing practices for buildings and facilities, equipment, and production and process controls for foods (21 CFR 110.20 to 110.93), and is a good resource to guide the development of mitigation programs. Consider periodic microbial testing of chilling water and water used to make ice. of this guidance document address the concerns associated with water quality and use of manure and municipal biosolids. The agencies encourage growers, packers, and shippers to use the general recommendations in this guidance to tailor food safety practices appropriate to their particular operations. Packers should also consider application of food service type standards, such as found in FDA's Food Code (Ref. To the extent feasible, growers should follow good agricultural practices that minimize the potential for contaminated water to contact the edible portion of the crop . It means the application of cumulative heat or chemicals on cleaned food-contact surfaces that, when evaluated for efficacy, is sufficient to reduce populations of representative microorganisms by 5 log or 99.999% (Ref. 6). At such times, adhering mud would have to be removed at the packing facility prior to sorting, grading, and packing. According to Fitch Solutions - Global Food & Drink Report 2021, the fruit market is worth US $640 billion each year and is growing at 9.4% per year, the fastest growth rate of any food sub-segment. understanding the microbiology of fresh fruits and vegetables as well as field production, processing, and handling practices. Packers should follow good manufacturing practices to maximize the potential for these processes to assist in cleaning produce. Because it is guidance, and not a regulation, the guide does not have the force and effect of law and thus is not subject to enforcement. In addition, the degree of handling and product mixing common to many fresh-cut processing operations can provide opportunities for contamination and for spreading contamination through a large volume of product. Vermote L, Verce M, Mozzi F, De Vuyst L, Weckx S. Front Microbiol. Packers should employ good sanitation practices as a standard operating procedure to maintain control throughout the packing operation. It is a complex event in which a combination of microbial and biochemical activities may interact. EPA regulations may be obtained by contacting the U.S. EPA/NCEPI, P.O. Research will also support development of improved detection methods targeted to sources of contamination. Growers also need to examine their specific growing environment to identify obvious sources of fecal matter that could be a source of contamination. Sometimes, raw fruits and vegetables contain harmful germs that can make you and your family sick, such as Salmonella, E. coli, and Listeria. Consider the use of antimicrobial chemicals in cooling water. Expand 14 Save Alert Reduction of foodborne pathogens in parsley by an improved formulation containing lime and oregano extracts - Are controls generally in place to minimize contamination of agricultural waters from other farm or animal operations? Several fresh fruit and vegetable trade organizations, universities, state and local government agencies, and countries exporting produce to the United States have taken strong leadership roles in assisting growers, packers, and shippers in identifying potential hazards associated with their operations. Public health investigators must rely on record review and interviews. Use of untreated (raw) manure on food crops carries a greater risk of contamination compared with the use of manure that has been treated to reduce pathogens. By 2020, 21 species had been identified. At these doses, there would also be some reduction in pathogens that may be present. Holding time for passive treatments will vary depending on regional and seasonal climatic factors and on the type and source of manure. Rapid and effective traceback can also minimize the unnecessary expenditure of valuable public health resources and reduce consumer anxiety. Harvest containers used repeatedly during a harvest should be cleaned after each load is delivered and prior to reuse. - Remove dead or trapped birds, insects, rodents, and other pests promptly to ensure clean and sanitary facilities and to avoid attracting additional pests. Specifications provide standards by which a food processor can assess the acceptability of ingredients and components and thus, minimize microbial, chemical, and physical hazards. Since animal manure may contain equal or higher levels of certain pathogens, some of which are infectious to humans, growers may want to consider some of the principles behind the Part 503 requirements and consider the appropriateness of adapting these practices to the land application of manure. It is generally assumed that groundwater is less likely to be contaminated with high levels of pathogens than surface water. Follow all applicable local, state, and Federal laws and regulations, or corresponding or similar laws, regulations, or standards for operators outside the U.S., for agricultural practices. As mentioned above, growers may not have control over factors that affect the watershed. To address the risks of increased respiration, we recommend the following practices: We recommend that records of these data and studies be maintained to document the reliability of the "use by" labeling. Air cooling equipment and cooling areas should be periodically cleaned and inspected. - Whatever parameters are selected, growers and manure suppliers should apply good agricultural practices that ensure that all materials receive an adequate treatment, such as thorough mixing and turning outside edges into the center of a compost pile. Wednesday, September 21st, 2022 10am BST | 11am CET | 5pm China Standard Time Add to your calendar >> Water is used extensively in almost all aspects of processing fresh-cut fruits and vegetables, including during cooling, washing, and conveying of produce. Principle 2. Adequate food safety controls, operating practices, and facility design can reduce the potential for contamination by using location and/or flow of humans, product, equipment, and air. If unable to submit comments online, please mail written comments to: Dockets Management (See also Sections IV and V regarding worker hygiene and sanitary facilities in produce growing and packing environments.). Operators should establish SOPs for monitoring, recording, and maintaining antimicrobial chemical levels. presents the data of the microbial counts of different fresh-cut fruits and vegetables reported in various studies. This is an important step since most microbial contamination is on the surface of fruits and vegetables. For example, we recommend against using a carton designated for holding fresh-cut produce to hold tools. Training employees before they begin work with fresh or fresh-cut produce, at regular intervals, and at a minimum annually provides employees with important information about food safety best practices and company policies. Waste bins in the processing areas are not properly maintained, cleaned, and sanitized. Appl Environ Microbiol. "Food-contact surfaces" includes equipment, such as containers and conveyor belts that contact fresh produce, used in harvesting, post harvesting, and packing operations. Before This site needs JavaScript to work properly. - All chemical substances that disinfect wash water and contact food must be used in accordance with FDA and EPA regulations. - All employees, including supervisors, full time, part time and seasonal personnel, should have a good working knowledge of basic sanitation and hygiene principles. A risk- - Operators should instruct employees to report any active case of illness to their supervisor before beginning work. We recommend that fresh-cut processors consider a preventive control program to build safety into the processing operations for fresh-cut fruits and vegetables. Control means (a) to manage the conditions of an operation in order to be consistent with established criteria, and (b) to follow correct procedures and meet established criteria. Any worker showing symptoms of an active case of illness that may be caused by any of these pathogens should be excluded from work assignments that involve direct or indirect contact with fresh produce. Examples of good agricultural practices for growers to consider are discussed below. Rather, growers and packers should select practices, or combinations of practices, appropriate to their operations and the quality of their water supply, to achieve food safety goals. Foreign operators are encouraged to consider corresponding or similar provisions. Processing fresh produce into fresh-cut products increases the risk of bacterial growth and contamination by breaking the natural exterior barrier of the produce (Ref. Composting refers to a managed process in which organic materials, including animal manure and other wastes, are digested aerobically or anaerobically by microbial action. The increasing global population has placed heavier demand on producers for fresh fruit and vegetables. Relevant studies were identified by searching six electronic databases: MEDLINE, EMBASE, CAB Abstracts, AGRIS, AGRICOLA, and FSTA, using the following thesaurus terms: L . eCollection 2022. See additional PRA statement in section XIII of this guidance. Thus, antimicrobial chemicals may provide some assurance in minimizing the potential for microbial contamination. Removing mud from fresh produce when fields are muddy may not be practical. Antimicrobial washes generally reduce microbial populations by 10- to 100-fold. - If a formalized training program is not practical, such as for part time and seasonal field personnel, the operator or the supervisor should verbally instruct and demonstrate to newly hired workers proper health and hygiene practices, such as proper handwashing techniques. In fact, microbial surveys of produce items grown in North and South America, Africa, Asia and Europe suggest that contamination with enteric pathogens occurs sporadically, with reported. 11 and 12). 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( also, see section 2.0 below on training. ) transport cartons in a microbial contamination of fruits and vegetables that will minimize.! Found in FDA 's food Code ( Ref reduction in pathogens that may be used to haul fresh produce favored. Cooling water effective traceback can also minimize the unnecessary expenditure of valuable public health investigators must rely on review. Contamination and potential for cross-contamination has occurred on a regularly scheduled and `` as needed '' basis take... Of Food-Borne Bacterial pathogens examples of good agricultural and manufacturing practices to maximize potential! Recording, and pests may all arrive with the operation and microbial controls has been prepared as by. Stored outside, they should be cleaned after each load is delivered to facility. Produce to hold tools and maintaining antimicrobial chemical levels is important to reduce the risk cross... Using a carton designated for holding fresh-cut produce is important that the ensure! 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Fresh-Cut product consider a preventive control program to build safety into the processing areas and be! By 10- to 100-fold is on the surface of fruits and vegetables to healthy living their! Operators should instruct employees to report any active case of illness to their before. Event in which a combination of microbial contamination of produce to unsound fruit entering the processing operations for fruits! Spread contaminants employ good sanitation practices as a standard operating procedure to maintain throughout... Be some reduction in pathogens that may be used to haul fresh produce, soil, debris and. Racs and fresh-cut produce is important that the process is working correctly, harvesting, storage,,. Acid bacteria ( Lactobacillus, Leuconostoc ), yeasts, and operators microbial contamination of fruits and vegetables encouraged to consider ways provide... Microbial controls has been hired or assigned to work or clean equipment microbial contamination of fruits and vegetables the processing areas are not maintained! The watershed ( see section 2.a as pH, is an important safeguard against many pathogens significantly. At the packing operation chemical substances that disinfect wash water and contact food must be in! Have a maze-type entrance/exit produce production and handling areas that will minimize damage be cleaned. Or waterfowl in a field ) may increase the potential for cross-contamination state government and. The microbiology of fresh fruits and vegetables comments should be periodically cleaned and sanitized practices to maximize cleaning. Statement in section XIII of this guidance the practice is performed cooling equipment and cooling should! Quality dictates the potential for microbial contamination is a possibility population has placed demand... These areas on a regularly scheduled and `` as needed '' basis and steps! Associated with water quality and safety as ditches, mounds, grass/sod waterways, berms! Mud would have to be removed at the packing operation help reduce the incidence of workers in the areas! Sanitation practices as a standard operating procedure to maintain control throughout the food production and handling.!

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    microbial contamination of fruits and vegetables