Copyright © 2002
by J. E. Williams, O.M.D.
All rights reserved, including the right to reproduce this work in any form whatsoever, without permission in writing from the publisher, except for brief passages in connection with a review.
Interior illustrations by Anne L. Louque
Cover design by Marjoram Productions
Cover image ©2002 Corbis Images / Picture Quest
About the cover image: Tobacco mosaic virus; the first virus to be isolated and also the first virus to be photographed by electronmicroscopy.
Interior photograph of influenza virus ©2002 Corbis Images / Picture Quest
Hampton Roads Publishing Company, Inc.
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Charlottesville, VA 22902
434-296-2772
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Library of Congress Catalog Card Number: 2002100967
ISBN 10: 1-57174-265-4
ISBN 13: 978-1-57174-265-0
10 9 8 7 6 5 4 3 2
Printed on acid-free paper in the United States