1. Clinical Virology, 3rd Floor, Clinical Sciences Building, Manchester Royal Infirmary, Oxford Road, Manchester, M13 9WL, UK; Department of Pathology, Thomas Jefferson University Hospital, Philadelphia, PA 19107; Gemeinenschaftslabor City Drs Fenner & Partner–Dept. Molecular Diagnostics, Bergstrasse 14, D-20095 Hamburg, Germany; Laboratorio di Patologia Clinica, Ospedale S. Anna, Via Napoleona 60,