THE REPLICATIVE INTERMEDIATE MOLECULE OF BOVINE VIRAL DIARRHEA VIRUS CONTAINS MULTIPLE NASCENT STRANDS

The replication of bovine viral diarrhoea virus (BVDV) RNA is consider ed to involve replicative intermediates (RI) and replicative forms (RF ) of virus RNA. These RNA species were radiolabelled metabolically by H-3-uridine in BVDV-infected cells and separated by sucrose gradient c entrifugation. RNA in the fractions was then digested with RNase A in high salt (2 x SSC) and the RNase-resistance was determined. Using the Baltimore formula, this led to the calculation that the RI of BVDV co ntained 6-7 nascent strands on the template. This suggests that the st ructure of the BVDV RI is similar to that of poliovirus and dengue 2 v irus.