Editor-in-Chief A.J. Zuckerman The Royal Free Hospital School of Medicine University of London Rowland Hill Street, Hampstead London NW3 2PF UK Editorial Assistant Sandy Giles Editorial Board J.E. Banatvala, London, UK J.C. Booth, London, UK M.A. Epstein, Oxford, UK H. Fukumi, Tokyo, Japan I.D. Gust, Parkville, Vie, Australia P. Halonen, Turku, Finland M.C. Horzinek, Utrecht, The Netherlands R. Hull, Norwich, UK G. Klein, Stockholm, Sweden H. Koprowski, Philadelphia, PA, USA C. Kunz, Vienna, Austria S.K. Lam, Kuala Lumpur, Malaysia C.R. Madeley, Newcastle-upon-Tyne, UK J.B. Mahony, Hamilton, Ont., Canada B.W.J. Mahy, Atlanta, GA, USA K. Maramorosch, Piscataway, NJ, USA T.P. Monath, Cambridge, MA, USA I.K. Mushahwar, North Chicago, IL, USA T.H. Pennington, Aberdeen, UK D.J. Robinson, Dundee, UK M. Roggendorf, Essen, Germany G.C. Schild, South Mims, Herts, UK G. Walters, Boxtel, The Netherlands