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HAI titers of sera from mice immunized with (A) 3 µg and (B) 10 µg inactivated influenza virus administered by intramuscular (IM) and microneedle (MN) routes of delivery compared to naïve (N) mice at 14 and 28 days after a single immunization (graphs express average±s.e) ap<0.05 when MN 10 µg is compared to the IM 10 µg group.
