In Singapore’s warm, humid climate—where infectious diseases can circulate year-round—the question of whether to receive an annual flu vaccine is more relevant than ever. Many people assume that once vaccinated, they’re protected long-term from influenza. However, health professionals and government agencies continue to recommend yearly flu shots. But why is that necessary?
This article explores the science behind the yearly flu vaccination recommendation, who should prioritise getting vaccinated, and how it plays a critical role in personal and public health in Singapore.
Understanding Influenza and Its Impact
Influenza is not just a common cold. It is a serious respiratory illness that can lead to complications such as pneumonia, bronchitis, sinus infections, and even hospitalisation. In severe cases—particularly among the elderly, children, and those with chronic conditions—it can be life-threatening.
In Singapore, seasonal influenza remains a major cause of acute respiratory illness and work absenteeism. Due to the country’s open borders and frequent international travel, influenza strains can spread quickly. That’s why the Ministry of Health (MOH) includes the flu vaccine in its National Adult Immunisation Schedule for recommended yearly protection.
Why Is Yearly Vaccination Necessary?
There are two key reasons why annual flu vaccinations are necessary: waning immunity and viral mutations.
First, the immunity you gain from the flu vaccine decreases over time. While the flu vaccine stimulates your immune system to create antibodies against influenza, these protective levels can drop within six to twelve months. As a result, even if you were vaccinated last year, your immunity may no longer be sufficient to protect you during the next flu season.
Second—and perhaps more importantly—influenza viruses are constantly mutating. Every year, the circulating strains of flu can change significantly. Global health authorities, including the World Health Organization (WHO), monitor flu trends and update the vaccine composition annually to match the expected strains. Getting vaccinated yearly ensures that you are protected against the most current and relevant virus strains.
Who Should Prioritise the Flu Vaccine in Singapore?
While the flu vaccine is generally beneficial for most individuals, certain groups are strongly advised to get the shot every year:
- Seniors aged 65 and above
- Children between 6 months and 5 years
- Pregnant women
- Individuals with chronic medical conditions such as asthma, diabetes, or heart disease
- Healthcare workers and caregivers
For these vulnerable populations, flu complications can escalate quickly. Moreover, because Singapore does not experience a fixed “flu season” like temperate countries, the risk of transmission is present year-round, which makes annual protection even more important.
Is It Still Useful If I Rarely Fall Sick?
Some people believe that if they are generally healthy or have strong immunity, they can skip the flu vaccine. However, influenza is unpredictable, and being healthy does not guarantee immunity to new strains. Even if the flu doesn’t make you very sick, you can still pass it on to more vulnerable individuals—like young children or elderly family members—before you show symptoms.
In public settings such as workplaces, schools, or public transport, flu viruses spread rapidly. Getting the vaccine helps reduce your risk of infection and transmission, contributing to community-level protection known as herd immunity.
What Are the Risks and Side Effects?
The flu vaccine is very safe for most individuals. Minor side effects may include mild fever, fatigue, or soreness at the injection site. Serious allergic reactions are rare. The benefits of annual vaccination far outweigh the temporary discomfort it may cause.
If you have a history of severe allergies to vaccine components, or if you’re unsure whether you’re eligible for the vaccine, consult your doctor. In Singapore, certified clinics like Keystone Clinic & Surgery can assess your suitability and administer the vaccine safely.
How Effective Is the Flu Vaccine?
The effectiveness of the flu vaccine varies each year based on how well the chosen vaccine strains match the circulating viruses. On average, flu vaccines reduce the risk of illness by 40% to 60% when the vaccine is well-matched.
Even in years where the match isn’t perfect, the vaccine still offers protection. It can reduce the severity of illness, lower the risk of complications, and decrease the likelihood of hospitalisation. For individuals with chronic conditions, this difference can be life-saving.
When Should You Get Vaccinated in Singapore?
Unlike countries with cold winters, Singapore experiences flu activity throughout the year. That means there’s no single “best” time for vaccination, although getting the shot before travel to temperate countries during their flu season (typically October to March) is advisable.
For maximum protection, get vaccinated annually as soon as the updated vaccine becomes available—usually by the third quarter of the year. The earlier you get it, the sooner you’re protected.
Is It Required for School or Work?
In Singapore, the flu vaccine is not mandatory but is strongly recommended, especially for healthcare and eldercare workers, teachers, and anyone working in high-contact settings. Some employers may also subsidise annual flu vaccinations as part of employee wellness programmes, recognising the benefits of reduced sick days and improved productivity.
Schools and childcare centres may encourage vaccination among children to prevent outbreaks, though it remains optional unless specific public health measures are implemented during flu surges.
Myths and Misconceptions About the Flu Vaccine
Let’s address a few common myths:
- “The flu vaccine gives you the flu.” This is false. The vaccine contains inactivated or weakened virus components that cannot cause illness.
- “I had the vaccine once and still got sick.” You might have been exposed before the vaccine became effective (it takes about two weeks), or you caught a different virus. Even so, the vaccine usually reduces the severity of symptoms.
- “Natural immunity is better.” Natural infection may give strong immunity, but it also comes with the risk of serious complications. Vaccination is a safer way to build protection.
Conclusion
The annual flu vaccine is a small step with significant benefits for individuals and the broader community in Singapore. Given the virus’s evolving nature and the reality of waning immunity, yearly vaccination remains the most effective way to stay protected.
Whether you’re young and healthy or managing a chronic condition, the flu shot can help you avoid sick days, prevent complications, and protect those around you. When it comes to influenza, prevention is always better than cure.
Protect Yourself and Others – Book Your Flu Shot Today
Don’t leave your health to chance. At Keystone Clinic & Surgery, we offer safe, MOH-recommended flu vaccine services in a comfortable and accessible environment. Our dedicated team will guide you through the vaccination process and help you stay protected year-round. Schedule your flu vaccination today at https://keystonemedical.com.sg or contact us for more information on individual and group bookings.
References
Familiesfightingflu.org. Do You Need a Flu Shot Every Year?. https://familiesfightingflu.org/do-you-need-a-flu-shot-every-year/
Lung.org. 7 Reasons You Need to Get a Flu Shot This Year. https://www.lung.org/blog/reasons-flu-shot
Drbolling.com. Do I Really Need a Flu Shot Every Year?. https://www.drbolling.com/blog/do-i-really-need-a-flu-shot-every-year