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Abstract
The Morbillivirus hemagglutinin (H) protein mediates attachment to the target cell. To evaluate its contribution to canine distemper virus neurovirulence, we exchanged the H proteins of the wild-type strains 5804P and A75 and assessed the pathogenesis of the chimeric viruses in ferrets. Both strains are lethal to ferrets; however, 5804P causes a 2-week disease without neurological signs, whereas A75 is associated with a longer disease course and neurological involvement. We observed that both H proteins supported neuroinvasion and the subsequent development of clinical neurological signs if given enough time, demonstrating that disease duration is the main neurovirulence determinant.
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