Foodborne pathogens Hazards, risk analysis and control Edited by Clive de W. Blackburn and Peter J. McClure Cambridge England Published by Woodhead Publishing Limited, Abington Hall, Abington Cambridge CB1 6AH, England www.woodhead-publishing.com Published in North America by CRC Press LLC, 2000 Corporate Blvd, NW Boca Raton FL33431, USA First published 2002, Woodhead Publishing Ltd and CRC Press LLC ©2002, Woodhead Publishing Ltd; except chapters 10, 11 and 12 which are ©2002, Chris Bell and Alec Kyriakides The authors have asserted their moral rights. This book contains information obtained from authentic and highly regarded sources. Reprinted material is quoted with permission, and sources are indicated. Reasonable efforts have been made to publish reliable data and information, but the authors and the publishers cannot assume responsibility for the validity of all materials. 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Woodhead Publishing ISBN 1 85573 454 0 CRC Press ISBN 0-8493-1213-2 CRC Press order number: WP1213 Cover design by The ColourStudio Typeset by SNPBest-set Typesetter Ltd., Hong Kong Printed by TJ International, Padstow, Cornwall, England Contributors Chapters 1 and 13 Chapter 2 Dr Clive Blackburn and Dr Peter Dr Roy Betts McClure Head of Microbiology Department Unilever R and D Colworth Campden and Chorleywood Food Colworth House Research Association Sharnbrook Chipping Campden Bedford Gloucestershire MK44 1LQ GL55 6LD UK UK Tel: +44 (0) 1234 781 781 Tel: +44 (0) 1386 842000 Fax: +44 (0) 1234 222277 Fax: +44 (0) 1386 842100 E-mail: E-mail: [email protected] [email protected] [email protected] Dr Clive Blackburn Details as above Chapter 3 Chapter 4 Dr David Legan Dr Tom Ross and Professor Tom Systems of the Future Group McMeekin Kraft Foods North America School of Agricultural Science R&D Centre 11–2 East University of Tasmania 801 Waukegan Road GPO Box 252–54 Glenview Hobart IL60025 TAS 7001 USA Australia Tel: (+1) 847 646 4637 Tel: +61 3 622 626 37 Fax: (+1) 847 646 4637 Fax: +61 3 622 626 42 E-mail: [email protected] E-mail: [email protected] [email protected] Dr Mark Vandeven Kraft Foods North America 200 DeForest Avenue Chapter 5 East Hanover N J 07936-1944 Professor Mac Johnston USA Animal and Public Health Division Royal Veterinary College Tel: (+1) 973 503 4430 University of London Fax: (+1) 973 503 3255 Hawkshead Lane E-mail: [email protected] N Mymms Herts Dr Martin Cole and Dr Cynthia AL9 7TA Stewart UK Food Science Australia 16 Julius Avenue Tel: +44 (0) 1707 666277 Riverside Corporate Business Park Fax: +44 (0) 1707 660671 PO Box 52 E-mail: [email protected] North Ryde 1670 Australia Tel: (+61) 2 9490 8522 (Cynthia Stewart) (+61) 2 9490 8379 Fax: (+61) 2 9490 8581 Chapter 6 Chapter 8 Dr John Holah and Dr Richard Ms Sara Mortimore Thorpe Pillsbury Europe Campden & Chorleywood Food Harman House Research Association Group 1 George Street Chipping Campden Uxbridge Gloucestershire Middlesex GL55 6LD UB8 1QQ UK UK Tel: +44 (0) 1386 842000 Tel: +44 (0) 1895 201193 Fax: +44 (0) 1386 842100 Fax: +44 (0) 1895 202509 E-mail: [email protected] E-mail: [email protected] Mr Tony Mayes Unilever R and D Colworth Chapter 7 Colworth House Professor Martyn Brown Sharnbrook Unilever R and D Colworth Bedford Colworth House MK44 1LQ Sharnbrook UK Bedford MK44 1LQ Tel: +44 (0) 1234 264808 UK Fax: +44 (0) 1234 222277 E-mail: [email protected] Tel: +44 (0) 1234 222351 Fax: +44 (0) 1234 222277 E-mail: [email protected] Chapter 9 Dr Chris Griffith Head, Food Research & Consultancy Unit School of Applied Sciences University of Wales Institute, Cardiff Colchester Avenue Campus Cardiff CF23 7XR UK Tel: +44 (0) 29 2041 6306 Fax: +44 (0) 29 2041 6306 E-mail: cgriffi[email protected] Chapters 10, 11 and 12 Chapter 15 Dr Chris Bell Dr Paul Gibbs Consultant Microbiologist Leatherhead Food RA White Gables 4 Quartermile Road Randalls Road Godalming Leatherhead Surrey Surrey GU7 1TG KT22 7RY UK UK Tel: +44 (0)1483 424535 Tel: +44 (0) 1372 376761 Fax: +44 (0)1483 417536 Fax: +44 (0) 1372 386228 E-mail: E-mail: [email protected] [email protected] Mr Alec Kyriakides Chapter 16 Head of Product Safety Sainsbury’s Supermarkets Ltd. Dr Marion Koopmans 33 Holborn Research Laboratory for Infectious London Diseases EC1N 2HT National Institute of Public Health UK and the Environment Antonie van Leeuwenhoeklaan 9 Tel: +44 (0) 20 7695 6000 Ext. 57487 3720BABilthoven Fax: +44 (0) 20 7695 7487 The Netherlands E-mail: [email protected] Tel: +31 30 2742 391 Fax: +31 30 2744 449 E-mail: [email protected] Chapter 14 Dr Jane Sutherland and Dr Alan Chapter 17 Varnam Food Microbiology Unit Dr Rosely Nichols and Professor School of Health and Sports Science Huw Smith University of North London Scottish Parasite 166–220 Holloway Road Diagnostic Laboratory London Stobhill Hospital N7 8DB Glasgow UK G21 3UW UK Tel: +44 (0) 207 753 3114 Fax: +44 (0) 207 753 3114 Tel: +44 (0) 141 201 3000 E-mail: [email protected] Fax: +44 (0) 141 558 5508 E-mail: [email protected] Chapter 18 Chapter 20 Dr Maurice Moss Dr Yasmine Motarjemi School of Biomedical and Life Food Safety Manager Sciences Nestlé Quality Management University of Surrey Department Guildford 55 Avenue Nestlé Surrey CH-1800 Vevey GU2 7HX Switzerland UK Tel: +41 21 9244 246 Tel: +44 (0) 1483 300800 Fax: +41 21 9242 810 E-mail: yasmine.motarjemi@nestlé.com Chapter 19 Professor Mansel Griffiths Chair in Dairy Microbiology and Director Canadian Research Institute for Food Safety Department of Food Science University of Guelph Guelph ON N1G 2WI Canada Tel: (+1) 519 824 4120 Fax: (+1) 519 763 0952 E-mail: mgriffi[email protected] Related titles from Woodhead’s food science, technology and nutrition list: Hygiene in Food Processing(ISBN: 1 85573 466 4) Drawing on the expertise of the prestigious European Hygienic Equipment Design Group (EHEDG) and other experts in this field, this major new collection promises to be the standard work on good hygiene practice in food processing. The coverage is truly comprehensive and includes hygiene regulation and legislation for both Europe and the USA. It opens with an examination of the general principles of hygiene, moves on to cover plant and equipment design and construction, before providing a complete overview of the food supply chain from farm to consumer. It will be an invaluable guide for all food processors. Making the most of HACCP(ISBN: 1 85573 504 0) Based on the experience of those who have successfully implemented HACCPsystems, this book will meet the needs of food processing businesses at all stages of HACCP system development. It will enable those new to HACCPto benefit from the experience of the pioneers; enable those with HACCPsystems to see how they can be developed and how they can help their partners in the supply chain; and inform those involved with enforcement and national HACCPstrategies about the practical issues involved in implementation along the supply chain. The collection is edited by two internationally recognised HACCPexperts and includes both major companies such as Cargill, Heinz and Sainsbury and the particular challenges facing SMEs. The scope of the book is truly international with chapters covering experiences of HACCPimplementation from countries including Thailand, India, China and Poland. The book also includes chapters by those responsible for HACCPenforcement on what enforcers look for and common weaknesses in HACCPimplementation. Microbiological Risk Assessment in Food Processing(ISBN 1 85573 585 7) Microbiological risk assessment is one of the most important recent developments in improving food safety management. Edited by two leading authorities in the field, and with a distinguished international team of experts, this book reviews the key stages and issues in MRA. Details of these books and a complete list of Woodhead’s food science, technology and nutrition titles can be obtained by: • visiting our web site at www.woodhead-publishing.com • contacting Customer Services (e-mail: [email protected]: fax: +44 (0)1223 893694; tel: +44 (0)1223 891358 ext. 30; address: Woodhead Publishing Ltd, Abington Hall, Abington, Cambridge CB1 6AH, England) If you would like to receive information on forthcoming titles in this area, please send your address details to: Francis Dodds (address, tel. and fax as above; e-mail: [email protected]). Please confirm which subject areas you are interested in. Contents List of contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . xiii Part I Risk assessment and management in the food chain 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Dr Clive Blackburn and Dr Peter McClure, Unilever R&D Colworth, UK 1.1 Trends in foodborne disease . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Incidence of foodborne disease . . . . . . . . . . . . . . . . . . . . . . 4 1.3 Foodborne disease surveillance . . . . . . . . . . . . . . . . . . . . . . 5 1.4 Emerging foodborne disease and changing patterns in epidemiology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.5 Control of foodborne disease . . . . . . . . . . . . . . . . . . . . . . . 9 1.6 Rationale for this book . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 1.7 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 2 Detecting pathogens in food . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Dr Roy Betts, Campden and Chorleywood Food Research Association, UK and Dr Clive Blackburn, Unilever R and D Colworth, UK 2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2.2 Acomparison of Quality Control and Quality Assurance . . . 14 2.3 Use of microbiology methods in a Quality Control system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 2.4 Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.5 Use of microbiology methods in a Quality Assurance system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.6 Conventional microbiological techniques . . . . . . . . . . . . . . . 19 vi Contents 2.7 Rapid and automated methods . . . . . . . . . . . . . . . . . . . . . . 21 2.8 Future trends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 2.9 References and further reading . . . . . . . . . . . . . . . . . . . . . . 45 3 Modelling the growth, survival and death of bacterial pathogens in food . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 Dr David Legan, and Dr Mark Vandeven, Kraft Foods North America; and Dr Cynthia Stewart and Dr Martin Cole, Food Science Australia 3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53 3.2 Approaches to modelling . . . . . . . . . . . . . . . . . . . . . . . . . . 54 3.3 Kinetic growth models . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 3.4 Growth boundary models . . . . . . . . . . . . . . . . . . . . . . . . . . 72 3.5 Death models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 3.6 Survival models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 3.7 Applications of models: product and process design, product shelf-life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 3.8 Applications of models: hygienic equipment design, HACCPsystems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 3.9 Applications of models: risk assessment, food safety objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86 3.10 Future trends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 3.11 Sources of further information and advice . . . . . . . . . . . . . . 91 3.12 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 4 Risk assessment and pathogen management . . . . . . . . . . . . . . . 97 Dr Tom Ross and Professor Tom McMeekin, University of Tasmania, Australia 4.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 4.2 The development of risk assessment . . . . . . . . . . . . . . . . . . 98 4.3 Risk assessment methodology . . . . . . . . . . . . . . . . . . . . . . . 106 4.4 Risk assessment tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 4.5 The role of risk assessment in pathogen management: food safety objectives and HACCPsystems . . . . . . . . . . . . . 117 4.6 Future trends . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 4.7 Sources of further information and advice . . . . . . . . . . . . . . 122 4.8 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 5 HACCPin farm production . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 Professor Mac Johnston, Royal Veterinary College, University of London, UK 5.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 5.2 Planning the HACCPsystem . . . . . . . . . . . . . . . . . . . . . . . 128