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The advent of recombinant DNA technology, development of infectious cDNA clones of RNA viruses, and reverse genetic technologies have revolutionized how viruses are studied. Genetic manipulation of full-length cDNA clones has become an especially important and widely used tool to study the biology, pathogenesis, and virulence determinants of both positive and negative stranded RNA viruses. The first...
This study was undertaken to re-evaluate safety aspects of the commercial modified live virus vaccine against equine viral arteritis (Arvac) in stallions. Ten seronegative stallions were administered a single dose of vaccine, whereas three others were used as controls. Presence of vaccine virus in blood, semen, and nasopharyngeal and conjunctival secretions was determined by virus isolation and reverse...
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