There are several types of flu vaccines available:
1. Inactivated Influenza Vaccine (IIV): Contains killed virus and is administered via injection. 2. Live Attenuated Influenza Vaccine (LAIV): Contains weakened live virus and is administered via nasal spray. 3. Recombinant Influenza Vaccine (RIV): Produced using recombinant technology and does not require egg-based production.