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Virus titers in nasal swabs and BALF samples of contact and principal pigs infected with the rgKS-107824 and/or singly mutated virus. (A) Virus titers in BALF samples of principal infected and contact pigs. (B) Virus titers in nasal swabs of infected pigs. (C) Virus titers in nasal swabs of contact pigs. The error bars represent SEM. *, P < 0.05; **, P < 0.01. The dotted line indicates the detection limit of the assay.
