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Journal of Veterinary Diagnostic Investigation, Vol 18, Issue 1, 7-17
Copyright © 2006 by American Association of Veterinary Laboratory Diagnosticians

Articles

High throughput detection of bluetongue virus by a new real-time fluorogenic reverse transcription-polymerase chain reaction: application on clinical samples from current Mediterranean outbreaks

MA Jimenez-Clavero, M Aguero, E San Miguel, T Mayoral, MC Lopez, MJ Ruano, E Romero, F Monaco, A Polci, G Savini, and C Gomez-Tejedor

Departamento de Enfermedades Emergentes, Laboratorio Central de Veterinaria, Algete, Madrid, Spain.

A real-time reverse transcription-polymerase chain reaction (RT-PCR) assay was developed for the detection of bluetongue virus (BTV) in blood samples. A combination of primers specific for a highly conserved region in RNA segment 5 (based on Mediterranean BTV sequences) and a DNA probe bound to 5'-Taq nuclease-3' minor groove binder (TaqMan MGB) was used to detect a range of isolates. This real-time RT-PCR assay could detect 5.4 x 10(-3) tissue culture infectious doses (TCID50) of virus per milliliter of sample, which was comparable to our current BTV diagnostic nested RT-PCR assay. The assay detected all recent Mediterranean isolates (including serotypes 2, 4, and 16), BTV vaccine strains for serotypes 2 and 4, and 15 out of the 24 BTV reference strains available (all serotypes), but did not detect the related orbiviruses epizootic hemorrhagic disease and African horse sickness viruses. Following assay evaluation, the ability of this assay to identify BTV in recent isolates (2003, 2004) from ovine and bovine samples from an epizootic outbreak in Spain was also tested. Minor nucleotide changes (detected by sequencing viral genomes) within the probe-binding region were found to have a profound effect on virus detection. This assay has the benefits of being fast and simple, and the 96-well format enables large-scale epidemiological screening for BTV, especially when combined with a high-throughput nucleic acid extraction method.


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