[1] Univ Glasgow, Inst Virol, MRC, Virol Unit, Glasgow G11 5JR, Lanark, Scotland
[2] Oklahoma State Univ, Ctr Vet Hlth Sci, Stillwater, OK 74078 USA
[3] Robert Koch Inst, D-1000 Berlin, Germany
[4] Johns Hopkins Sch Med, Baltimore, MD USA
[5] Wayne State Univ, Sch Med, Detroit, MI USA
[6] Univ Chicago, Marjorie B Kovler Viral Oncol Labs, Chicago, IL 60637 USA
[7] Univ Melbourne, Sch Vet Sci, Melbourne, Vic, Australia
[8] Univ Liege, Fac Vet Med, Liege, Belgium
[9] Univ Cambridge, Dept Pathol, Cambridge CB2 1QP, England