Influenza vacccines is administrered -: (A) Intranasal instillation, (B) Intradermal, (C) Nasal drops, (D) Intrathecal
Answer is A. The earliest vaccine was the virus attenuated by repeated egg passage. These administered by intranasal instillation REF:ANANTHANARYANAN TEXTBOOK OF MICROBIOLOGY 9EDITION PGNO.504