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SCV detection in pharyngeal swabs taken at 0, 2 or 4 d.p.i. from macaques treated with PBS (control group; n = 4) or pegylated IFN-α prophylactically (n = 6) or postexposure (n = 4). Eq, equivalents. Data are expressed as mean ± s.d. *, P < 0.05; **, P < 0.01 compared with control group at 2 d.p.i.
