What is the Tdap vaccine for?
The Tdap vaccine is a 3-in-1 booster that protects against three serious bacterial infections: tetanus (lockjaw), diphtheria, and pertussis (whooping cough). It works by prompting your immune system to make antibodies and antitoxins, so your body can neutralise the toxins these bacteria produce.
Is the Tdap vaccine the same as a tetanus shot?
Not quite. Tdap covers tetanus, diphtheria and pertussis. The Td vaccine covers only tetanus and diphtheria — it leaves out the whooping cough component. Adults are generally advised to have one Tdap dose, then Td boosters thereafter.
What's the difference between Tdap and DTaP?
They protect against the same three diseases but are formulated for different ages. DTaP is the childhood vaccine, given as a series in infancy. Tdap is the booster for older children, teenagers and adults — it contains lower doses of the diphtheria and pertussis components to reduce side effects while still boosting immunity.
How often do I need a Tdap booster?
Most adults need a single Tdap dose if they've never had one, followed by a tetanus-diphtheria (Td) booster every 10 years. If you have a deep or dirty wound and your last booster was more than 5 years ago, you may need one sooner.
How long does the Tdap vaccine last?
Protection lasts roughly 10 years, which is why a booster every decade is recommended. Immunity from childhood vaccination fades over time, so boosters keep your antibody levels high enough to protect you.
Why is the Tdap vaccine recommended in pregnancy?
A Tdap dose is recommended in every pregnancy, usually between 27 and 36 weeks. The antibodies you make cross the placenta and protect your newborn from whooping cough in their first months — before they are old enough to be vaccinated themselves.
Do I need a Tdap shot to be around a newborn?
It's strongly advised. Whooping cough is dangerous for babies, and adults often pass it on without realising. If your last Tdap was more than 10 years ago, a booster is recommended for parents, grandparents, caregivers and anyone in regular close contact with a newborn — an approach sometimes called cocooning.
I stepped on a rusty nail. Do I need a tetanus jab?
Possibly. If your last tetanus-containing vaccine was more than 5 years ago, or you're unsure, see a doctor promptly. Deep or dirty wounds need proper cleaning and may warrant a booster.
Is it safe to have the Tdap vaccine more than once?
Yes. Booster doses are given at intervals precisely to maintain immunity, and a Tdap dose is recommended in each pregnancy — so repeated doses across a lifetime are both safe and expected.
Is the tetanus vaccine compulsory in Singapore?
No. Under Singapore law, only diphtheria and measles vaccination are legally required for children. Tetanus and pertussis protection is nonetheless included in the childhood schedule, and boosters are strongly recommended for adults.
What are the side effects of the Tdap vaccine?
Most people have only mild reactions: pain, redness or swelling at the injection site, mild fever, headache, tiredness or muscle aches. Some feel faint straight after. In children, crying, irritability or sleepiness is common. These usually settle within a few days.
Who should be cautious about the Tdap vaccine?
Tell your doctor if you've had an allergic reaction to a previous dose, if you had a serious nervous-system reaction after a previous dose, if you have a bleeding disorder or take blood thinners, if you're unwell or feverish today, or if you're pregnant, planning a pregnancy or breastfeeding.
Is the Tdap vaccine the same as the TB vaccine?
No. Tdap protects against tetanus, diphtheria and pertussis. Tuberculosis is a separate infection with its own vaccine, BCG, given at birth in Singapore.
Which Tdap vaccine brands are used?
Boostrix and Adacel are the Tdap vaccines commonly used. If you only need tetanus and diphtheria cover, a Td vaccine may be given instead. Our doctors will advise which is appropriate.
Is the Tdap vaccine subsidised in Singapore?
Tdap is on the National Adult Immunisation Schedule (NAIS). Subsidies are available for eligible groups — notably pregnant women — at CHAS GP clinics, and for Pioneer and Merdeka Generation cardholders. MediSave can also be used. Contact us to check what applies to you.
