Figure 3.

Mean peak virus titers present in nasopharyngeal swabs (left panel) and tracheal lavages (right panel) of chimpanzees that had been infected simultaneously by the intranasal and intratracheal routes with the indicated recombinant wild-type or attenuated RSVs. The cp248/404 virus is a recombinant version of the biologically derived cpts248/404 virus that retained mild residual virulence in RSV-naive infants and serves as a benchmark. The dotted line indicates the limit of detectability.