Influenza sends thousands of Singaporeans to hospital each year, and it is not the same as a common cold. Annual vaccination cuts your risk of infection and, if you still catch the flu, usually makes the illness milder.
This guide covers who should get the jab under Singapore's immunisation schedules, where to book it at a GP or polyclinic, what to expect at the appointment, and when to skip vaccination.
Flu vs the Common Cold: Why Vaccination Matters
Influenza is a viral respiratory infection. Symptoms arrive suddenly: fever, chills, body aches, sore throat, cough, and headache.
The virus spreads through respiratory droplets when an infected person coughs or sneezes, and through contaminated surfaces touched before touching your mouth, nose, or eyes.
Unlike a cold, influenza can cause severe illness and life-threatening complications, especially in high-risk groups.
How the Flu Vaccine Works
Influenza vaccination targets influenza virus types A and B.
When a significant portion of the population is vaccinated, it creates a protective barrier, known as herd immunity, which reduces the spread of the virus. This protects vaccinated individuals and those who cannot receive the vaccine for medical reasons.
Even if you still catch the flu after vaccination, the illness is typically milder with lower risk of hospitalisation, complications, and death.
Who Should Get the Flu Vaccine in Singapore
According to the National Adult Immunisation Schedule (NAIS) and childhood immunisation schedule, the flu vaccine is recommended for all healthy adults, children aged six months and above, frequent travellers, and caregivers.
It is strongly recommended for high-risk groups:
- Adults aged 65 and above.
- Young children from six months to under five years.
- Pregnant women at all stages of pregnancy.
- People with chronic conditions (heart and lung disease, liver and kidney disease, diabetes, stroke, dementia, Parkinson's disease, intellectual disability).
- People with blood disorders (leukaemia, lymphoma, multiple myeloma, thalassemia major).
- People with suppressed immunity from disease, cancer treatment, or long-term medication such as corticosteroids or biologics.
- Residents of intermediate or long-term care facilities.
- Children and adolescents aged six months to 18 years on long-term aspirin therapy.
Vaccination is particularly important for children, who are more susceptible to severe flu complications. Pregnant women should also get vaccinated to protect themselves and their unborn babies.
When and Where to Get Vaccinated
Get vaccinated as soon as the vaccine becomes available, typically before flu season peaks. Late-season vaccination still offers protection.
Flu vaccines are available at GP clinics, paediatric clinics, and polyclinics. Check with your provider for current schedules and availability.
What Happens at the Vaccination Appointment
Tell your healthcare provider about allergies, previous vaccine reactions, current medications, and any underlying conditions before the jab.
The vaccine is injected into muscle or just under the skin. The procedure takes seconds. One dose per year is recommended because flu viruses mutate and immunity wanes over time.
Side Effects and When to Skip the Vaccine
Most people experience no side effects or mild ones: soreness at the injection site, low-grade fever, or muscle aches lasting a few days.
Severe allergic reactions (anaphylaxis) are rare. Seek immediate help if you develop facial swelling, difficulty breathing, or a widespread itchy rash.
Do not get vaccinated if you:
- Are currently unwell with a fever.
- Have a severe allergy to antibiotics such as neomycin, gentamicin, or polymyxin B.
- Had a severe allergic reaction to a previous flu vaccine.
- Have a history of severe egg allergy (non-hives symptoms). These patients should receive the vaccine in a controlled hospital setting.
People with severe allergies to any vaccine component should not receive it. Consult your doctor if you are unsure.
Common Flu Vaccine Myths
Myth: The flu shot gives you the flu. The vaccine contains killed or weakened virus that cannot cause influenza in healthy individuals. Mild post-vaccine aches are not the flu.
Myth: The flu shot does not work. Vaccine effectiveness varies year to year depending on how well strains match circulating viruses. Even partial protection reduces severity and complications.
What to do next
Book your flu shot as soon as vaccines arrive, usually before the peak season. Call your enrolled GP or check child immunisation schedules if you are vaccinating children.
Travelling soon? Pair flu vaccination with travel vaccines in one clinic visit where possible. Elderly parents should combine the jab with regular health check-ups.
If you have severe egg allergy or a past anaphylactic reaction to a flu vaccine, tell the clinic before booking and follow their referral pathway.
