- Protects against
- Influenza
- How given
- Injection in the thigh or upper arm, or a nasal spray for children in some countries.
- Doses
- Two doses four weeks apart in the first year of vaccination, then a single dose every season.
- Reactions
- Usually mild
About this vaccine
The influenza vaccine is given every year rather than once, because the circulating strains shift between seasons and protection fades over several months. It is recommended from six months of age in the US, UK and Australia, and offered as an option in several other schedules. A child receiving it for the first time usually needs two doses about four weeks apart; after that, one dose each season. In the UK and some other countries, children are given a nasal spray rather than an injection.
What it protects against
When it's given
United StatesCDC · 2026
- 6 months and olderDose 1
- 12-23 monthsDose 2
- 11-12 yearsDose 3
- 13-18 yearsDose 4
Ages follow the schedules listed above. Your pediatrician may adjust timing for your child.
How it's given
Injection in the thigh or upper arm, or a nasal spray for children in some countries.
Side effects & safety
Soreness at the injection site, and sometimes a mild fever or achiness for a day. The nasal spray often causes a runny or blocked nose for a few days.
Most babies have little or no reaction. Any soreness or fever tends to be brief.
When to call your doctor: if fever exceeds 40°C, lasts more than 2 days, or your child seems unusually unwell.
Common questions
Sources
- Influenza vaccines: WHO position paper · WHO, 2022.
Information on this page is compiled from authoritative public health sources and written in TinyDose's own voice. It is intended for general understanding only. Always follow your pediatrician's guidance.
From the blog
All guides →This information is provided by TinyDose for general understanding only and is not medical advice. Vaccine names, ages and doses can vary by country, brand and individual circumstances. Always follow the guidance of your pediatrician or local health authority for your child’s vaccination schedule.
© 2026 Alpstack · TinyDose