Advances in PARASITOLOGY VOLUME 28 Editorial Board W. H. R. Lumsden Department of Genitourinary Medicine, Royal Infirmary, Edinburgh EH3 9YW, UK P. Wenk Tropenmedizinisches Institut, Universitat Tubingen, D7400 Tubingen 1, Wilhelmstrasse 3 1, Federal Republic of Germany C. Bryant Department of Zoology, Australian National University, G.P.O. Box 4, Canberra, A.C.T. 2600, Australia E. J. L. Soulsby Department of Clinical Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 OES, UK K. S. Warren Director for Health Sciences, The Rockefeller Foundation, 1133 Avenue of the Americas, New York, N.Y. 10036, USA J. P. Kreier Department of Microbiology, College of Biological Sciences, Ohio State University, 484 West 12th Avenue, Columbus, Ohio 4321C1292, USA M. Yokogawa Department of Parasitology, School of Medicine, Chiba University, Chiba, Japan C. Combes Department de Biologie Animale, UniversitC de Perpignan, Avenue de Villeneuve, 66025, Perpignan Cedex, France Advances in PARASITOLOGY Edited by J. R. BAKER Cambridge, England and R. MULLER CAB International Institute of Parasizology SI Albans, England VOLUME 28 ACADEMIC PRESS Hurcourt Brace Jovunovich, Publishers London San Diego New York Berkeley Boston Sydney Tokyo Toronto ACADEMIC PRESS LIMITED 24/28 Oval Road LONDON NWl 7DX United States Edition published by ACADEMIC PRESS INC. San Diego, CA 92101 Copyright 0 1989, by ACADEMIC PRESS LIMITED AN Rights Reserved No part of this book may be reproduced in any form by photostat, microfilm, or any other means, without written permission from the publishers British Library Cataloguing in Publication Data is available ISBN 0- 12-031728-1 Typeset by Bath Typesetting Ltd., Bath, England Printed in Great Britain by the University Press, Cambridge CONTRIBUTORS TO VOLUME 28 M. L. ADAMSON, Department of Zoology, University of British Columbia, Vancouver, Canada S . J. BALL,Polytechnic of East London, Romford Road, Stratford, London E 1 5 4 L Z , UK D. A. P. BUNDY,Parasite Epidemiology Research Group, Department of Pure and Applied Biology, Imperial College of Science, Technology and Medicine, Prince Consort Road, London S W7 2BB, UK E. S. COOPER*,Parasite Epidemiology Research Group, Department of Pure and Applied Biology, Imperial College of Science, Technology and Medicine, Prince Consort Road, London S W7 2BB, UK P. R. GARDINER, International Laboratory for Research on Animal Diseases ( I L R A D ) , P.O. Box 30709, Nairobi, Kenya W. M. HUTCHISON, Biology Division, Department of Bioscience and Biotechnology, University of Strathclyde, 16 Richmond St, Glasgow GI I X Q . UK M . H . JACKSON, Biology Division, Department of Bioscience and Biotechnology, University of Strathclyde, 16 Richmond St, Glasgow GI I X Q , UK P. L. LONG, University of Georgia College of Agriculture, Athens, GA 30602, U S A R. M . PITTILO, Kingston Polytechnic, Penrhyn Road, Kingston-upon- Thames, Surrey K T l 2EE, UK * Presently on attachment to Tropical Metabolism Research Unit, Faculty of Medicine, University of West Indies, Kingston 7, Jamaica. V This Page Intentionally Left Blank PREFACE In this volume we offer a slight predominance of protozoological papers, somewhat redressing the helminthological bias of most volumes. We start with two related papers. Firstly, Drs Ball, Pittilo and Long comprehensively review the less fashionable, but economically very important, coccidia other than Toxoplasma and its close relatives-the so-cal