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Groups consisting of 5–6 cotton rats challenged intranasally with 2.25 x 105 pfu of RSV (Tracy) were treated at +1 or +2 d with mAb or PBS (control) intramuscularly. Viral titer was assessed 4 d post-challenge. SD = standard deviation. P-values were determined by ANOVA with a follow-up Dunnett’s pairwise comparison test.
