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Virus replication in throat and nose swabs after low- and high-dose Mex4487 influenza virus inoculation. The virus loads, measured by RT-PCR in tracheal swabs and nose swabs, over time are shown. A1 to A12, animals 1 to 12. Gray areas at the bottom of the graphs indicate the lower limit of detection of the assay (3,162 RNA copies/ml).
