Home>Vaccination Services> Seasonal Influenza Vaccine
2024/25
Seasonal Influenza Vaccine
Winter (January to March) and summer (July to August) mark the peak seasons for the flu in Hong Kong, presenting a significant health threat. Influenza A viruses, such as H3N2 and H1N1 strains, persistently circulate, while influenza B viruses also pose a risk. During flu outbreaks, widespread infections can occur, and severe cases can lead to increased mortality rates, placing a heavy burden on society.
To ensure the safety of yourself and your loved ones, it is crucial to familiarize yourself with the flu vaccine. Take proactive measures now by staying informed about the available flu vaccine options.
The following 3 vaccines are recommended for use in Hong Kong by the Scientific Committee on Vaccine Preventable Diseases:
Inactivated Influenza (IIV)
Recombinant Influenza Vaccine (RIV)
Live Attenuated Influenza Vaccine (LAIV)
| Inactivated Influenza Vaccine | Recombinant Influenza Vaccine | Live Attenuated Influenza Vaccine | |
| Vaccine Type | Contains killed (inactivated) virus | Contains recombinant protein | Contains weakened live virus |
| Administration | Intramuscular injection | Intramuscular injection | Nasal spray |
| Suitable for | 6 months and above | 18 years and above; (Research shows it offers a 30% higher protection level for individuals aged >50 compared to other vaccines.) | Ages 2 to 49 |
| Pregnant women and immunocompromised individuals | Suitable | Suitable | Contraindicated |
| Common side effects | Pain, redness and swelling at the site of injection | Pain, redness and swelling at the site of injection | Mild nasal congestion or runny nose |
| Covered by Vaccination Subsidy Scheme (VSS) | Yes | Yes | Yes |
The above information is for reference only. Consult a medical professional for specific recommendations.
*Eligible individuals must provide relevant documentation for the government subsidy programme. Visit the Centre for Health Protection’s website for more details.
No! It takes about two weeks for immunity to develop.
Get vaccinated now!
Inactivated Influenza Vaccine
The inactivated influenza vaccine contains killed viruses and does not involve eggs or live influenza viruses during manufacturing. It is given through a muscle injection and is suitable for individuals aged 6 months and older, including healthy individuals, pregnant women, and those with chronic health conditions. Common side effects after vaccination may include redness, swelling, and pain at the injection site. Some individuals may experience rare symptoms such as fever, chills, fatigue, or muscle pain.
Recombinant Influenza Vaccine
The recombinant influenza vaccine is produced using genetic recombination technology and contains hemagglutinin, a surface antigen of the influenza virus. It is administered via muscle injection and is recommended for individuals aged 18 years and older. Research suggests that the recombinant influenza vaccine may offer enhanced protection for older adults compared to standard-dose inactivated influenza vaccines. Common side effects after vaccination include redness and pain at the injection site. Some individuals may also experience headaches, fatigue, muscle pain, and joint pain.
Live Attenuated Nasal Spray Influenza Vaccine
The live attenuated influenza vaccine contains weakened flu viruses and is administered through nasal spray. It is recommended for individuals aged 2 to 49 years who are not pregnant and do not have compromised immune systems. Common side effects after vaccination may include nasal congestion, runny nose, and in some cases, fever in children.
Trivalent and quadrivalent influenza vaccines differ in the number of influenza virus strains they contain. The World Health Organization typically recommends the specific viral strains for both types of vaccines.
Why should I get vaccinated against the flu?
Getting vaccinated is an effective measure to prevent seasonal influenza and its associated complications. It can help reduce the risk of hospitalization and death resulting from influenza.
When should I get the seasonal influenza vaccine?
The most effective time to get the annual seasonal influenza vaccine is in October or November, at the start of the new flu season. However, it is recommended to receive the vaccine at least two weeks before the peak period to ensure sufficient time for the body to develop antibodies.
How many doses of influenza vaccine should be administered each year?
Children aged 9 years and older and adults: One dose per year.
Children under 9 years old: Two doses for the initial vaccination, with a four-week interval between each dose. Subsequently, one dose should be administered each year.
Is it necessary to get the influenza vaccine every year?
Yes, it is recommended. The strains of influenza viruses can change each year, and immunity to influenza can diminish over time. According to the World Health Organization's recommendations, it is advisable to receive a new influenza vaccine annually. The Advisory Committee on Immunization Practices also advises that individuals aged 65 and older receive the seasonal influenza vaccine, as they are at a higher risk of complications, hospitalization, and death from influenza.
- Prior appointment is required before using the service
- Service Location ﹕
Hong Kong Island - 17/F, Virtus Medical Tower, 122 Queen’s Road Central, Central, Hong Kong
Kowloon - 11/F, H Zentre, 15 Middle Road, Tsim Sha Tsui, Kowloon - Those eligible for the Government’s Vaccination Subsidy Scheme must present relevant supporting documents. For details, please visit Centre for Health Protection - Department of Health.
