SIR, — Since July 2004, the Veterinary Laboratories Agency (vla) has been screening all bovine viral diarrhoea virus (bvdv) antigen elisa-positive blood samples with a TaqMan reverse transcriptase-pcr (rt-pcr) test that discriminates between bvdv type 1 (bvdv-1), type 2 (bvdv-2) and Border disease
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Cranwell et al. (2007) studied this question.
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