Table 3 Difference in the level of specific IgA antibody to influenza virus (ng/mouse) between vaccination route and age

From: Assessment of Age-Related Decline of Immunological Function and Possible Methods for Immunological Restoration in Elderly

	3 months old	18 months
1) i.n. → i.n.	172 ± 42	54 + 50
2) i.v. → i.p.	2 + 2	2 ± 2

1) Mice were administered intranasally (i.n.) with A/PR/8/34 vaccine (10 mg) and boosted 3 weeks later i.n. with the same vaccine. Antibody was assessed 1 week after the boosting
2) Mice were administered intravenously (i.v.) with A/PR/8/34 vaccine (10 mg) and boosted 3 weeks later intraperitoneally (i.p.) with the same vaccine. Antibody was assessed 1 week after the boosting

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