This vaccine is a nasal spray type of live attenuated influenza vaccine. Live attenuated vaccines use viruses that have been weakened to eliminate pathogenicity while retaining their ability to stimulate an immune response. Other currently used live vaccines include:

・MR (Measles-Rubella) vaccine (injection)
・Varicella (Chickenpox) vaccine (injection)
・Mumps vaccine (injection)
・Rotavirus vaccine (oral)

FluMist was approved in the United States in 2003 and, as of April 2023, is approved in 36 countries and regions. It is now available in Japan this season. Because it is administered via the nasal passage, it induces both local immunity through mucosal IgA and systemic immunity.

Vaccine Details
Vaccine Name: FluMist Nasal Spray (Manufactured by: Daiichi Sankyo Co., Ltd.)
・Eligible Age Group: 2 to 15 years (Administered only in the Pediatrics Department; pediatric services cover up to junior high school students)
・Dosing: 1 dose for all eligible ages
・Administration: Spray 0.1 mL into each nostril (a fine mist)

Vaccine Strain:Nasal spray uses WHO-recommended strains

Injectable vaccines use strains specified by the Ministry of Health, Labour and Welfare (MHLW)
Interval with Other Vaccines: No specific restrictions

Precautions
・Allergies:Please inform us if you have allergies to eggs or gelatin.
・Asthma:Inform us if you have a history of asthma.
・Testing:After receiving the nasal vaccine, influenza tests may show a false positive due to the vaccine virus.

Main Side Effects
・Nasal congestion
・Runny nose
・Cough
・Sore throat

Note: This vaccine is administered as a nasal spray, not an injection.