The Influenza B Virus Victoria and Yamagata Lineages Display Distinct Cell Tropism and Infection-Induced Host Gene Expression in Human Nasal Epithelial Cell Cultures.

Seroconversion rates, defined as a greater than four-fold increase between pre- and post-vaccination sera, were slightly higher for the vaccine strains compared to the circulating viruses, but these differences did not reach statistical significance ( Figure 2 B).

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