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Infectious virus titers in unvaccinated and vaccinated personnel. (A) Viral titers in nasal swabs determined by standard plaque assay, (B) viral titers broken down by vaccine type. Error bars represent the standard deviation, and the dashed line represents the detection limit of the plaque assay. Symbols below this line were negative by the plaque assay, but positive by the CPE assay. Asterisks indicate statistical significance determined by Tukey's multiple comparisons test.
