Live intranasal influenza vaccine: what to know

The nasal route places the vaccine at the lining of the nose, where influenza viruses commonly enter. The viruses in the vaccine are weakened so they are intended to stimulate immunity without producing ordinary influenza illness. This is different from an injected inactivated vaccine, which uses non-replicating material.

A clinician needs your age, health history, vaccination history, allergies, pregnancy status, and medicines before recommending a product. Nasal congestion or a recent illness may also affect the appointment.

Tell the vaccination provider about immune-system problems, severe allergies, pregnancy or plans for pregnancy, long-term medicines, and any previous reaction to influenza vaccination. Mention whether you have a blocked nose or are feeling unwell, because the provider may need to adjust the plan.

Afterward, a runny or blocked nose, mild tiredness, headache, or a low fever may occur. Follow the clinic's instructions and keep your vaccination record available for future seasonal decisions.

Get urgent help for difficulty breathing, swelling of the face or throat, collapse, or a rapidly spreading itchy rash after vaccination. Contact a clinician if symptoms become severe, fever persists, or you have reduced immunity and feel unwell.

Ask whether the nasal vaccine is suitable for you, whether an injected option is more appropriate, when seasonal vaccination should be arranged, and what symptoms should prompt medical advice.