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Antiviral activity in 4 BAL fluid samples against pdmH1N1 (102/2009), sH1N1 (Siriraj-03/2006), and H3N2 (Siriraj-04/2003) viruses using the hemagglutination inhibition (HI) assay. The assay was run in duplicate with and without oseltamivir. HI titers are shown as the geometric mean with 95% CI (**, P < 0.005; ***, P < 0.0001; t test).
