2025/26 Influenza Vaccine

Getting vaccinated early before the flu season can effectively reduce the risk of infection and complications, protecting both yourself and your family. Based on previous local monitoring, Hong Kong typically experiences a flu peak from January to March/April each year, with some years seeing a resurgence in July to August. Since the influenza virus can mutate from time to time, and the vaccine composition is updated according to the circulating strains each season, it is recommended that eligible individuals complete their vaccinations early to establish a protective barrier before the peak season arrives.

Why Annual Vaccination is Recommended

The influenza virus changes frequently, and the vaccine for each year is adjusted based on global surveillance data to improve its match with circulating strains. When the vaccine aligns with the circulating strains, studies show significant protective benefits for individuals under 65 years of age. It generally takes about two weeks for the body to develop sufficient antibodies after vaccination, so the best practice is to complete vaccination before the season begins. Even if vaccination occurs during the season, it still provides a certain level of protection.

Do Healthy Individuals Need the Flu Vaccine?

The flu vaccine can provide 70-90% preventive effectiveness, significantly reducing the risk of contracting the influenza virus. Even healthy individuals can become seriously ill with the flu, experiencing complications that may require hospitalization.

Eligible Groups

• Individuals aged 6 months and older (except those with contraindications)
• Pregnant women
• Seniors aged 65 and older
• Individuals with chronic diseases
• Healthcare workers
• Children and adolescents

Safety and Common Reactions

Seasonal flu vaccines have a good safety profile. Common short-term reactions include pain or redness at the injection site, mild fever, muscle soreness, or fatigue, which usually resolve on their own within one to two days.

If you experience severe or persistent discomfort, breathing difficulties, widespread rash, or swelling of the face/throat after vaccination, seek medical attention immediately and inform healthcare personnel of your vaccination history.

Precautions

• Annual vaccination is recommended.
• Inform healthcare personnel of any allergies and medical history before vaccination.
• Pregnant women and individuals with chronic diseases should consult a doctor for specific advice.
• It is advisable to inquire with a doctor for more information before vaccination.