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Virus recovery from the lungs of mice challenged with PR8 (H1N1) at 3 or 5 dpi. Mice were fed a standard diet or a diet supplemented with 125 ppm 25(OH)D3 for 7 weeks and then challenged with PR8 (H1N1) intranasally. The viral titers in the lung homogenates at 3 or 5 dpi were measured (PFU/g) for each group (n = 6 mice/group). *, significant difference (p < 0.05).
