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Log reduction in Influenza A titre after 1 min exposure to three pH 3.5 nasal spray compositions in solution test versus a phosphate buffered saline control. PBS: Phosphate buffered saline, pH 7.0. PAP: PCA/ascorbic acid/phytic acid, pH 3.5. PCP: PCA/citric acid/phytic acid, pH 3.5. PAZ: PCA/ascorbic acid/zinc acetate, pH 3.5
