Vaccines you may have missed after 18 and why they still matter

Most people think vaccinations end after childhood, but immunity can weaken with age. From flu shots to HPV vaccines, adults may still need protection against several serious diseases.

In Short

• Doctors say vaccine protection can fade, making adult boosters necessary over time
• Crowded workplaces, travel and public transport raise adults' infection exposure risks
• Pregnancy, chronic illness and weak immunity can increase chances of severe disease

For many people, childhood memories of vaccines come with fear, tears, and nervous visits to the doctor. Once school vaccinations are over, most assume they are finally free from injections forever.

But the truth is, vaccinations are not only for children. Adults also need vaccines to stay protected against infections and serious diseases.

In fact, many adults miss important vaccines simply because they are unaware they still need them. Some assume the immunity from childhood vaccines lasts forever, while others believe vaccines are only necessary during outbreaks or travel.

However, doctors say immunity can weaken with time, making booster shots and adult vaccines essential for long-term protection.

Adult vaccination has become increasingly important today because people are constantly exposed to new environments, travel frequently, and interact with larger groups of people.

Workplaces, public transport, crowded cities, and international travel all increase the risk of infections. Certain medical conditions, pregnancy, stress, and lifestyle changes can also weaken immunity over time.

Healthcare experts also point out that adults with chronic illnesses, weakened immune systems, or those undergoing treatments like chemotherapy or steroid therapy are at a much higher risk of severe infections.

Vaccines help reduce complications, hospitalisation, and long-term health problems.

According to Dr. Anjali S Raj, Consultant – Neonatology at Manipal Hospital, vaccines work by creating immune memory in the body.

But as people age, this immune memory gradually reduces, meaning the body may no longer fight infections as effectively as it once did. This is why booster doses and adult vaccinations become important.

WHY ADULT VACCINATION MATTERS

Vaccines train the immune system to recognise and fight harmful viruses and bacteria. Over time, however, immunity can fade. Adults, therefore, need booster doses to maintain protection against several diseases.

Another major reason is exposure. Adults travel more, work in public settings, and meet people from different regions, increasing the chances of coming into contact with infections. Certain professions, especially healthcare workers and daycare staff, face even greater exposure risks.

Pregnancy is another stage where immunity may temporarily weaken, making some vaccines important for both the mother and baby. Similarly, people with diabetes, autoimmune diseases, liver disease, or weakened immunity may require additional protection.

IMPORTANT VACCINES ADULTS SHOULD CONSIDER

INFLUENZA (FLU) VACCINE

Doctors recommend taking the flu vaccine every year because influenza viruses keep changing. The vaccine helps reduce the risk of severe flu infections, hospitalisation, and complications, especially in older adults and people with low immunity.

TDAP BOOSTER

Many adults forget that protection against tetanus does not last forever. The Tdap vaccine protects against tetanus, diphtheria, and pertussis (whooping cough) and is generally recommended every 10 years.

This vaccine becomes especially important after injuries, cuts, or during pregnancy.

HPV VACCINE

The HPV vaccine is one of the most important vaccines for cancer prevention. It helps protect against infections caused by the Human Papillomavirus, which is linked to cervical cancer and several other cancers.

Many people assume HPV vaccination is only for teenagers, but doctors say adults who missed it earlier may still benefit after consulting a healthcare provider.

HEPATITIS B VACCINE

Hepatitis B can lead to chronic liver disease, liver failure, and cirrhosis. Adults working in healthcare settings, laboratories, or daycare centres are strongly advised to take this vaccine because of higher exposure risks.

MMR VACCINE

The MMR vaccine protects against measles, mumps, and rubella. Adults who may not have received complete doses during childhood or women planning pregnancy are often advised to discuss this vaccine with their doctor.

CHICKENPOX (VARICELLA) VACCINE

Adults who never had chickenpox as children may develop more severe complications if infected later in life. Vaccination helps prevent serious issues like pneumonia and brain inflammation.

PNEUMOCOCCAL AND MENINGOCOCCAL VACCINES

These vaccines protect against serious bacterial infections that can lead to pneumonia and meningitis. They are especially recommended for older adults, people with chronic illnesses, and those with weakened immunity.

VACCINES FOR FREQUENT TRAVELLERS

Travel can expose people to infections that may not be common in their home country. Depending on the destination, doctors may recommend vaccines for:

• Hepatitis A
• Typhoid
• Japanese Encephalitis
• Yellow Fever

Travel vaccines are particularly important for international travellers visiting regions where these infections are common.

DON’T WAIT FOR AN ILLNESS TO THINK ABOUT VACCINATION

One of the biggest misconceptions about vaccines is that healthy adults do not need them. In reality, prevention is always easier than treatment. Vaccines not only protect individuals but also reduce the spread of infections within families and communities.

Doctors advise adults to maintain a vaccination record and discuss pending or booster vaccines during regular health checkups. A simple vaccine today could prevent serious illness in the future.

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