S2 Cells transfected with in vitro-transcribed CrPV-2 and CrPV-3 RNAs accumulate infectious virions over time. A total of 2.5 × 106 S2 cells were transfected with 3 μg of the indicated in vitro-transcribed genomic RNA or infected with CrPV (MOI of 0.4). Titers were measured as described in Materials and Methods at 3, 12, 24, and 48 hpt. Shown are averages from at least three independent experiments (± standard deviations). *, P < 0.05; **, P < 0.005; ND, not detected.