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Single-step (A) and multistep (B) growth curves for the chimeric recombinant viruses SN-BM, SN-BG, and SN-BMBG and the parental viruses SN and SB. NA cells were infected in duplicate at an MOI of 5 (A) or 0.01 (B), and the titers of virus in the tissue culture supernatants were determined at the indicated time points. Data are the means (± SE) of results from three independent experiments. FFU, focus-forming units.
