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Newcastle disease viruses (NDV) isolated from pigeons (pigeon paramyxovirus type 1; PPMV-1) are mostly of mesogenic pathotype and characterized by a polybasic amino acid sequence motif at the fusion protein (F) cleavage site. This feature also applies to isolate R75/98 from Germany. Its genome consists of 15,192 nucleotides and it specifies an intracerebral(More)
Newcastle disease virus (NDV), also designated as Avian paramyxovirus type 1 (APMV-1), is the causative agent of a notifiable disease of poultry but it exhibits different pathogenicity dependent on the virus strain. The molecular basis for this variability is not fully understood. The efficiency of activation of the fusion protein (F) is determined by(More)
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