Comparative immunogenicity of trivalent influenza vaccine administered by intradermal or intramuscular route in healthy adults.

Publication Type
Journal Article
Year of Publication
Belshe, Robert B; Newman, Frances K; Wilkins, Ken; Graham, Irene L; Babusis, Elizabeth; Ewell, Marian; Frey, Sharon E
Date Published
2007 Sep 17
Adult; Antibodies, Viral; Dose-Response Relationship, Immunologic; Female; Health; Humans; Influenza Vaccines; Injections, Intradermal; Injections, Intramuscular; Male; Middle Aged; Titrimetry

The present study was undertaken with controls using equal doses ID and IM plus the standard full dose IM to assess the role of route of vaccine in immunogenicity of inactivated influenza vaccine. The study was a prospective, randomized, active-controlled, open label clinical trial conducted in healthy young adult outpatients to compare the effect of route (IM versus ID) on antibody responses to influenza vaccine. Volunteers received 3, 6 or 9 microg of vaccine by ID or IM route; 15 microg IM was also studied. Low doses of vaccine given by either route were almost as immunogenic as the standard 15 microg IM dose of influenza vaccine. ID route was not superior to IM vaccine at inducing antibodies. ID vaccine induced significantly more local inflammatory response than IM vaccine.