Influenza is a viral infection. It can make your child very unwell, even if they are usually healthy.
Influenza can lead to serious conditions like severe lung infections (pneumonia) or swelling in the brain (encephalitis).
It is recommended that all children aged six months or older have an annual vaccination to protect them against influenza. Influenza vaccines are free for all children aged six months to under five years and can be given at the same time as age-specific vaccines.