5-in-1/ 6-in-1 Vaccine

By combining protection against several infections into one vaccine, fewer injections are needed while still ensuring comprehensive coverage. These vaccines form a key part of routine childhood immunisation schedules and help safeguard children during their most vulnerable years.

What is a 5-in-1 vaccine?

The 5-in-1 vaccine is a combination vaccine that protects infants against five serious childhood diseases in a single injection. These include:

• Diphtheria — a bacterial infection that can cause severe throat swelling, breathing difficulty and heart complications.
• Tetanus — a serious infection that affects the nervous system and causes painful muscle stiffness and spasms.
• Pertussis (whooping cough) — a highly contagious respiratory infection that can lead to severe coughing fits and breathing problems in babies.
• Polio — a viral infection that can cause paralysis and long-term disability.
• Haemophilus influenzae type b (Hib) — a bacterial infection that can lead to meningitis, pneumonia, and other serious invasive diseases in young children.

By combining protection against these five infections, the vaccine reduces the number of separate injections required during early infancy.

What is a 6-in-1 vaccine?

The 6-in-1 vaccine provides protection against all five diseases covered by the 5-in-1 vaccine, with the addition of:

• Hepatitis B — a viral infection that affects the liver and can lead to chronic liver disease, cirrhosis or liver cancer later in life.

This combined vaccine helps simplify the immunisation schedule while ensuring comprehensive protection during early childhood.

What is the difference between 5-in-1 and 6-in-1 vaccine?

The main difference between the two vaccines is that the 6-in-1 vaccine includes protection against hepatitis B in addition to diphtheria, tetanus, pertussis, polio and Hib. A doctor will advise on which vaccine is appropriate based on the child’s immunisation history and national vaccination guidelines.

Who should receive the 5-in-1 or 6-in-1 vaccines?

The 5-in-1 and 6-in-1 vaccines are primarily recommended for infants as part of routine childhood immunisation. Early vaccination helps protect babies during a period when they are most vulnerable to serious infections. In certain cases, older children who have missed scheduled doses may also require catch-up vaccination.

• Infants — as part of the National Childhood Immunisation Schedule to build protection early in life
• Children requiring catch-up vaccination — those who missed earlier doses or have incomplete immunisation records

A doctor will review your child’s vaccination history and advise on the appropriate schedule.

At what age is the 5-in-1 or 6-in-1 vaccine given?

The vaccine is typically administered as a series of doses during infancy. In Singapore, the usual schedule includes doses at 2 months, 4 months and 6 months of age, followed by a booster dose later in childhood according to national guidelines. Timely completion of the series helps ensure optimal and long-lasting protection.

How effective are the 5-in-1 or 6-in-1 vaccines?

The 5-in-1 and 6-in-1 vaccines are highly effective in protecting against the serious diseases they target. Clinical studies and long-term immunisation programmes have shown strong protection against diphtheria, tetanus, pertussis, polio, Hib, and hepatitis B when the full course is completed. Widespread vaccination has significantly reduced the incidence of these infections in countries with established immunisation schedules.

How many doses are required for 5-in-1 or 6-in-1 vaccines?

The vaccine is given as a primary series during infancy, typically at 2, 4 and 6 months of age. A booster dose is administered later in childhood according to national immunisation guidelines to maintain long-term protection. Completing the full schedule is important to ensure optimal immunity.

How long does the 5-in-1 or 6-in-1 vaccine last?

The 5-in-1 and 6-in-1 vaccines provide strong protection during early childhood when infants are most vulnerable to serious infections. Immunity develops after completion of the primary series in infancy, but protection can gradually decrease over time for certain components, such as pertussis.

For this reason, booster doses are included in the national immunisation schedule to maintain long-term protection. Additional boosters for some diseases, such as tetanus and diphtheria, may also be recommended later in childhood or adulthood. Completing the full vaccination schedule ensures sustained and optimal immunity.

Are 5-in-1 and 6-in-1 vaccines safe?

The 5-in-1 and 6-in-1 vaccines have been extensively studied and are widely used in national immunisation programmes around the world. They undergo strict safety evaluations before approval and continue to be monitored through established vaccine safety systems. For most infants, these vaccines are well tolerated and serious reactions are rare. Vaccination is carried out under medical supervision to ensure safety and suitability.

What are the possible side effects of 5-in-1 or 6-in-1 vaccines?

Side effects are generally mild and short-lived, reflecting the body’s normal immune response to vaccination.

• Injection site pain — soreness or tenderness where the vaccine is given
• Mild fever — a temporary rise in temperature after vaccination
• Fussiness — increased irritability in the hours following the injection
• Temporary swelling — mild swelling or redness at the injection site

Most symptoms settle within a few days. Medical advice should be sought if fever persists or if unusual reactions occur.

How are the 5-in-1 or 6-in-1 vaccines administered?

The vaccine is given during a clinic visit following a brief medical review to ensure your child is well and suitable for immunisation.

• Medical consultation — the doctor reviews your child’s health history and vaccination records before proceeding.
• Vaccine administration — the vaccine is given as an injection, usually into the thigh in younger infants or the upper arm in older children.
• Observation period — a short monitoring period may follow to ensure there are no immediate reactions.

Most babies are able to go home shortly after the appointment.

How can parents prepare for their child’s vaccination appointment?

A little preparation can make the visit smoother for both parent and child.

• Bring vaccination records — this helps ensure doses are given according to schedule.
• Ensure your child is well — vaccination may be postponed if your child has a high fever or is acutely unwell.
• Dress your child comfortably — clothing that allows easy access to the thigh or upper arm can make the process quicker.
• Plan for aftercare — be prepared to monitor your child at home and provide comfort if needed.

What should parents expect after 5-in-1 or 6-in-1 vaccines?

Most children tolerate the vaccine well, but mild reactions are common and temporary.

• Mild fever — a low-grade temperature may develop within the first 24–48 hours.
• Injection site discomfort — some redness, swelling or tenderness at the injection site.
• Temporary irritability or sleepiness — babies may be slightly more fussy or tired than usual.

These symptoms usually settle within a few days. Medical advice should be sought if fever is high, persistent or if any unusual symptoms occur.

Who should delay or avoid 5-in-1 or 6-in-1 vaccination?

The 5-in-1 and 6-in-1 vaccines are safe for most infants and children. However, certain situations may require postponement or further medical assessment before vaccination.

• Severe allergy to vaccine components — children who have had a serious allergic reaction to a previous dose or to any ingredient in the vaccine should not receive it without specialist advice.
• Acute illness with high fever — vaccination may be delayed if the child is currently unwell with a significant fever until recovery.
• Specific medical conditions — certain neurological conditions or immune-related disorders may require individual assessment to determine suitability.

A doctor will review your child’s health history and advise whether vaccination should proceed or be rescheduled.

Summary

The 5-in-1 and 6-in-1 vaccines provide early protection against several serious childhood infections, including diphtheria, tetanus, pertussis, polio, Hib and hepatitis B. Given during infancy as part of the national immunisation schedule, these combination vaccines help reduce the number of injections while ensuring comprehensive protection during a child’s most vulnerable years. Completing the recommended schedule supports long-term immunity and contributes to safer, healthier development.

If you would like to ensure your child’s vaccinations are up to date or have questions about the 5-in-1 or 6-in-1 vaccine, schedule a consultation with A1 Medical for personalised immunisation advice and care.