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IFN resistance of BRSV in MDBK and Vero cells. MDBK cells (solid columns) or Vero cells (open columns) were infected at an MOI of 1 with rBRSV and treated with the indicated amounts of recombinant IFN-α A/D. Infectious virus titers were determined 3 days postinfection. Bars represent standard deviations.
