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Nonstructural protein 7 (nsp7) of porcine reproductive and respiratory syndrome virus (PRRSV) is considered to be a suitable reagent for the development of serological diagnostic assays. It can be expressed as a soluble recombinant protein in Escherichia coli, and its antibody response may continue up to 202 days post-infection. Furthermore, the region encoded by nsp7 is highly homologous among various...
This study was conducted to evaluate the virulence and evolution of genotype IX Newcastle disease virus (NDV) isolates obtained from wild birds in the northern Qinling Mountains of China. Five isolates were obtained from 374 larynx and cloacae swabs, which were collected from multiple asymptomatic wild bird species from August 2008 to July 2011, and were subsequently characterized by pathotype and...
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