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Infection of 4-week-old pigs with plasmid-derived wild-type and NS1 mutant Sw/TX/98 viruses on day 5 p.i. (A) Mean percentage (± standard error of the mean [SEM]) of lung surface with macroscopic lesions. (B) Microscopic lesions (± SEM) in the medium-sized bronchioles. (C) Virus titers (± SEM) in BALF.
