VIRULENCE IN NEWCASTLE DISEASE VIRUS: A Preliminary Study

Abstract
A. P. WATERSON, M.D. M.R.C.P., T. H. PENNINGTON, M.B. B.S., W. H. ALLAN, B.V.M.S. M.R.C.V.S.; VIRULENCE IN NEWCASTLE DISEASE VIRUS: A Preliminary Study, Britis