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Susceptibility of Culicoides variipennis sonorensis to Infection by Polymerase Chain Reaction-Detectable Bluetongue Virus in Cattle Blood

Cattle bloods containing only polymerase chain reaction (PCR)-detectable bluetongue-10 viral nucleic acid, but as determined by virus isolation techniques, not bluetongue-10 virus, were incapable of infecting intrathoracically inoculated Culicoides variipennis sonorensis. These insects also failed to transmit bluetongue-10 virus when fed on sheep. Cattle whose blood contain only PCR-detectable bluetongue viral nucleic acid, but no infectious virus, are unlikely to play a role in the epidemiology of bluetongue. The biological significance of PCR-based detection assays and their effect on animal health regulations on the international trade of livestock and livestock germplasm is discussed. Bluetongue virus infection provides a very useful model with which to study arthropod-transmitted RNA virus infections of humans and other animals.

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				P. P. C. Mertens, N. S. Maan, G. Prasad, A. R. Samuel, A. E. Shaw, A. C. Potgieter, S. J. Anthony, and S. Maan Design of primers and use of RT-PCR assays for typing European bluetongue virus isolates: differentiation of field and vaccine strains J. Gen. Virol., October 1, 2007; 88(10): 2811 - 2823. [Abstract] [Full Text] [PDF]