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Viral lung titers in vaccinated mice. Vaccinated BALB/c mice challenged with A/California/07/2009 (A) or A/Brisbane/59/2007 (B) at week 13 postvaccination had lungs collected (3 mice/group/time point) on day 3 postinfection and percent survival assessed. Viral lung titers are listed as PFU per gram of lung tissue. The vaccines used for vaccination listed on the x axis.
