| molecular characterization of a virulent genotype viid strain of newcastle disease virus from farmed chickens in shanghai. | a virulent newcastle disease virus strain was isolated from diseased chickens in shanghai, china. the isolated strain was initially characterized as highly virulent because of a short mean death time in embryonated chicken eggs and specific-pathogen-free chickens and was typed as neurotropic by intracloacal inoculation of chickens. the isolated strain had a dibasic amino acid motif in the fusion protein cleavage site sequence required for systemic replication in the host cell. the strain fell in ... | 2011 | 21793446 |