| isolation and analysis of two naturally-occurring multi-recombination newcastle disease viruses in china. | two newcastle disease viruses (ndv), designated qg/hebei/07 and xd/shandong/08, were isolated from infected chicken flocks in china in 2007 and 2008, respectively. the results of phylogenetic and recombination analyses on complete ndv genome sequences (excluding terminal segments) show that the qg/hebei/07 isolate had evidence of recombination in the m and f genes, and recombination in the xd/shandong/08 isolate in the f, l genes and the non-coding region between the hn and l genes. these two na ... | 2010 | 20363269 |
| phylogenetic characterization of newcastle disease virus isolated in the mainland of china during 2001-2009. | twenty newcastle disease virus (ndv) isolates from infected chicken flocks during 2001 to 2009 in china were biologically and genetically characterized. all the 20 ndvs were categorized into velogenic (n=17) and lentogenic (n=3) viruses, respectively, according to the mean death time (mdt) of chicken embryos. velogenic viruses carry the motif (112)r-r-q-k-r/f(117) (n=14) or (112)g-r-q-g-r/l(117) (n=3) at the f0 cleavage site, while all the lentogenic virus had a sequence motif of (112)g-r-q-g-r/ ... | 2010 | 19833457 |