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Humoral immune responses of 7 calves to bluetongue virus (BTV) infection were evaluated by plaque-reduction assay and immunoblotting. Most readily interpretable results were obtained with the immunoblot assay when colostrum-deprived calves were used, and sera were reacted with proteins in partially purified extracts of BTV. Viremia persisted in calves for 35 to 56 days, and BTV coexisted in blood for several weeks with virus-specific neutralizing antibody. Calves developed antibody to virus protein 2, the major determinant of virus neutralization, at 14 to 28 days after inoculation; this time interval also coincided with the appearance of neutralizing antibody in serum. Virus clearance in BTV-infected calves did not coincide with humoral immune responses to protein 2 or other virion proteins.
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