When is influenza more common in Hong Kong?
Influenza occurs throughout the year in Hong Kong, with activity usually higher from January to April and July to August. The timing can vary, and infection is still possible in other months.
When should I arrange vaccination?
The 2026/27 vaccination programmes began on 17 September 2026. Local guidance recommends vaccination in October or November. Antibodies usually take about two weeks to develop after vaccination; the vaccine does not provide complete protection.
If you have missed the optimal period
If you have missed the optimal period, you can still get vaccinated as soon as possible. When CHP advises prompt vaccination because influenza activity is rising, do not wait for the next winter or summer peak.
Planning for a child
A child aged 6 months to under 9 who has never received seasonal influenza vaccine needs two doses at least 28 days apart. Ask the clinician to confirm dose history early so the schedule has room for the required interval.