The following have kindly contributed to the revision of this book:

Dr Barbara Bannister	Dr Mary Ramsay
Dr Ronald Behrens	Rosemary Tucker
Prof David Bradley	Dr Eric Walker
Dr Peter Chiodini	Dr John Watson

Thanks are also due to the medical staff at the Department of Health and the Public Health Laboratory Service, particulary Dr B Evans, Dr A Nicoll and Dr Carol Joseph who read and commented on the text, Dr N Byrne, Dr C Conlon and Diabetes UK.

Emma Wilbraham, Jeff Porter and Julie Pettman masterminded production. Without them this revision would never have seen the light of day.

Thanks are also extended to the original contributors Dr A Bulman, B Carroll, Prof R Cartwright, Dr C Dow, Dr R Fairhurst, Dr J Porter, Dr J Sergeant and Prof D Warrell. Much of the information on disease risks is reproduced, with their kind permission, from the World Health Organization booklet International Travel and Health - Vaccination Requirements and Health Advice 2001, to which acknowledgement is made. Our thanks in particular go to the editor Mary Vallanjon.

Comments, corrections and suggestions for improving future editions of this publication, are welcome (see page 147).

Dr Gil Lea	Dr Jane Leese
Public Health Laboratory Service	Department of Health
Communicable Disease Surveillance Centre
Editors