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Viral lung load. Viral lung load (EID50/10 mg lung) in pigs 3 days after aerosol infection with swine influenza A viruses; statistics: asterisk (1 p < 0.05, 2 p < 0.010, 3 p < 0.005, comparison of following groups: a H1N1/1981:H1N1/2006, b H1N1/1981:H1N2/2000, c H1N1/1981:H3N2/2006, d H1N1/2006:H1N2/2000, e H1N1/2006:H3N2/2006, f H1N2/2000:H3N2/2006).
