Immune Responses of Healthy Subjects to a Single Dose of Intramuscular Inactivated Influenza A/Vietnam/1203/2004 (H5N1) Vaccine after Priming with an Antigenic Variant

Abstract
Background. We administered a single dose of influenza A/Vietnam/1203/2004 (H5N1, clade 1) vaccine to subjects who had received 2 doses of influenza