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Levels of replication of H2 influenza viruses in the respiratory tracts of mice. Levels of replication of H2 influenza viruses in the lungs (A) and nasal turbinates (B) of mice following intranasal inoculation of the viruses indicated on days 1, 2, 3, 4, and 7 p.i. Virus titers are expressed as mean log10 TCID50s/g of tissue ± the standard error.
