Influenza Vaccination

Influenza causes a viral infection better known as the flu. Unlike other more common viral infections, influenza can potentially cause life-threatening complications in vulnerable populations such as children, elderly, pregnant women, or those with significant chronic health conditions affecting the lungs, kidneys, liver, or immunity.

Influenza A or B can be diagnosed at our clinics after symptom onset by a simple rapid swab test and treated with symptomatic medications. Tamiflu can also be given if you are suitable.

However, the best way is to prevent influenza infections via vaccination.

Every year, 2 influenza vaccines will be released:

- Southern Hemisphere Influenza Vaccine (First half of the year)

- Northern Hemisphere Influenza Vaccine (Second half of the year)

You can choose to take one or both vaccines annually.

Our vaccines are quadrivalent vaccines (4 strains)

Who should take the influenza vaccine?


Those aged 6 months to under 5 years are advised to take the influenza vaccine.

Singaporean Children aged 6months to 5 years pay $0 if eligible annually or per season, under Singapore's National Childhood Immunisation Schedule (NCIS).

Table 1: Patients’ Co-payment Fee Caps at CHAS GP Clinics (Child)


Eligible Child (Singaporean)

Child Developmental Screening


​Influenza (INF) (trivalent or quadrivalent)


Diphtheria, tetanus and acellular pertussis, inactivated poliovirus and Haemophilus influenzae type b (DTaP- IPV-Hib) (5-in-1)


DTaP- IPV-Hib-HepB (6-in-1)


Human papillomavirus (HPV2)


Measles, mumps and rubella (MMR)


Measles, mumps, rubella and varicella (MMRV)


Pneumococcal conjugate (PCV10)


Pneumococcal conjugate (PCV13)


Pneumococcal polysaccharide (PPSV23)




Tetanus, reduced diphtheria and acellular pertussis (Tdap)


Varicella (chickenpox) (VAR)




Age 65 and above

- Annual or per season vaccination is advised

Below Age 65

- Recommended if the individual has any of the following conditions or indications:

  1. Chronic disorders of the pulmonary or cardiovascular systems, including asthma;

  2. Requires medical follow-up or hospitalisation due to chronic metabolic diseases (including diabetes mellitus), renal, neurologic, hepatic, or haematologic disorders;

  3. Immunosuppression (including immunosuppression caused by medications, HIV or other immunodeficiencies)

  4. Women at all stages of pregnancy

  5. Persons receiving Intermediate and Long Term Care (ILTC) services

National subsidies are available for Singaporeans who have the above conditions.

Table 2: Patients’ Co-payment Fee Caps at CHAS GP Clinics (Adult)


Also recommended for vaccination are those in high risk occupations like Healthcare or those who live in communal accomodations like hostels or dormitorites.

How is it given

It is given via intramuscular injection into your arm. In young chikdren, it can be administered into the thigh,

Common Side Effects

- Soreness or redness at injection Site

- Fever, Headache, Bodyaches

- Giddiness (usually transient)

Most side effects go away within the first 3 days and simple painkillers like paracetamol can be taken if you do not have any allergies.


[1] Health Hub (2022) Retrieved from

[2] Centers for Disease Control and Prevention. (2022, August 31). Influenza vaccination: A summary for clinicians. Centers for Disease Control and Prevention. Retrieved from

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