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In vivo replication ability of the two H3N2 and one H3N6 CIVs. Replication ability in 6-week-old mice. (A) Mice were euthanized on day 3 p.i., and their nasal turbinates and lungs were collected and titrated for virus infectivity in eggs. (B) Mice were monitored for body weight loss throughout the observation period for 14 days.
