IAFP 2009 Program Book and Abstract Book - AB17

ILSI North america symposium series S5 Pathogen and Spoilage Persistence in the Processing Environment and Food Products – Where, Why and How Do We Know? While the phenomenon and importance of “persistence” have been recognized since “Typhoid Mary”, the use of molecular subtyping methods for characterizing both foodborne pathogens and spoilage microorganism has increased our understanding and appreciation of microbial persistence throughout the food chain. This symposium will address microbial persistence from primary production to processing, including the importance of persistence in foodborne disease outbreaks. Attendees will gain an understanding of microbial persistence, including the importance of controlling persistence and understanding persistence throughout the food chain. Microbial Persistence and Factors Affecting It – An Overview R. BRUCE TOMPKIN, LaGrange, IL, USA There is renewed acknowledgement that certain pathogens can persist in food processing environments, contaminate the food and lead to foodborne illness. Two pathogens are of particular concern, salmonellae and Listeria monocytogenes. Many examples could be cited where these pathogens have become established and contaminated multiple lots of food over long periods of time (e.g., weeks, months). Large numbers of consumers were exposed before the offending foods were identified and removed from the market. Among the factors influencing persistence are temperature, available nutrients and moisture. For example, Salmonella serovars are not likely to persist in refrigerated rooms because their lower limit for growth is 7-8°C. Likewise, moisture is essential for growth of Salmonella in operations producing dry foods (e.g., peanut butter, chocolate, dry milk products). Salmonella persistence has been recognized since at least the 1960’s-70’s. Microbiologists generally have received little, if any, education about how to establish effective programs to detect trends toward loss of control and how to investigate and correct the source(s) of contamination. An additional weakness has been in deciding when the data indicate a significant problem. Pathogen growth within equipment that appears visually clean before start of production also has not been universally recognized. The principles of persistence apply to preventing unacceptable spoilage and have been recognized for decades but the more recent experiences with pathogen control have brought control of the spoilage flora to a new level. Listeria monocytogenes: Molecular Ecology and Persistence KENDRA K. NIGHTINGALE, John N. Sofos and Martin Wiedmann, Colorado State University, Fort Collins, CO, USA Listeria monocytogenes is an environmental pathogen that can be found in virtually all environments along the food production chain, including the food processing plant environment. Contamination of the plant environment by L. monocytogenes is a significant problem for Ready-to-Eat (RTE) food processing plants, particularly if RTE products are exposed to the environment post-processing. The ability of L. monocytogenes to persistently colonize niches within the food processing plant environment, which are not readily accessible during routine cleaning and sanitation (also known as harborage sites), can be particularly problematic. This presentation will cover findings from longitudinal studies to monitor L. monocytogenes contamination patterns in RTE food processing plants to specifically identify harborage sites and to elucidate routes of transmission associated with contamination of finished RTE food products. Results from these studies suggest that L. monocytogenes can persistently colonize niches within the RTE food processing plant environment and that typically a single of few molecular subtypes persist in a given plant. As L. monocytogenes can also persist in environments outside of the food processing plant, including farms, urban and natural environments, as well as retail environments, interpretation of subtype data to define persistence can be difficult in some instances. Overall, routine environmental testing for L. monocytogenes combined with molecular subtyping of positive samples is critical though to identify harborage sites and routes through which the pathogen in transmitted to finished product processing areas or the finished RTE product. Real-time communication of sampling and subtyping results to food processing plants followed by critical interpretation of these data and implementation of stringent sanitation controls to eliminate harborage sites and interrupt transmission is essential. Abstract Book — 17 ILSI Symposia

IAFP 2009 Program Book and Abstract Book

Table of Contents for the Digital Edition of IAFP 2009 Program Book and Abstract Book

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