system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Influenza vacccines is administrered -
assistant
The correct answer is  The earliest vaccine was the virus attenuated by repeated egg passage. These administered by intranasal instillation REF:ANANTHANARYANAN TEXTBOOK OF MICROBIOLOGY 9EDITION PGNO.504