Seasonal influenza is an acute illness of the respiratory tract caused by influenza viruses. Influenza occurs in Hong Kong throughout the year but is usually more common in periods from January to March / April and from July to August. It is advised to be vaccinated in autumn.
Influenza vaccination is one of the effective means in preventing influenza and its complications together with reduction in influenza-associated hospitalisation and death. Given that the Seasonal Influenza Vaccination offers protection against influenza and its complications, all members of the public, except those with known contraindications, should receive the vaccine annually for personal protection.