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Infection of 12-week-old pigs with H3N2 cluster I, II, and III swine influenza viruses. (A) Mean percentage of lung surface with macroscopic lesions on day 5 p.i. (B) Microscopic lesions in the medium bronchioles on day 5 p.i. (C) Virus titers in BALF on day 5 p.i. TCID50, 50% tissue culture infective dose.
