Immunization and Vaccination Across the Lifespan: Protecting Children and Adults from Preventable Diseases

 

By Stephanie Nwakaegho, Gentechnews Health Columnist

 

Immunization is one of the greatest achievements of modern medicine. Through vaccination, millions of deaths from infectious diseases have been prevented worldwide. Vaccines stimulate the body’s immune system to recognize and fight harmful microorganisms such as viruses and bacteria before they can cause serious illness. According to global health authorities, routine immunization protects individuals against numerous life-threatening diseases including measles, tetanus, diphtheria, polio, and hepatitis.

Vaccination is not only important for infants and children but also for adolescents, adults, men, women, and pregnant mothers. Immunization throughout life provides long-term protection against infectious diseases and helps prevent outbreaks within communities. When vaccination coverage is high, it also creates herd immunity, protecting individuals who cannot be vaccinated due to medical conditions.

This column explores the vaccines recommended across different stages of life, the diseases they prevent, and the serious consequences that can arise when immunization is neglected.

Understanding Immunization and Vaccination

Vaccination involves administering a biological preparation containing weakened or inactive microorganisms, or parts of them, to stimulate the body’s immune response. Once vaccinated, the immune system produces antibodies and memory cells that recognize the pathogen if it enters the body again.

This means the body can fight the disease quickly before severe illness develops.

Vaccines are carefully developed and tested to ensure safety and effectiveness before being recommended for public use.

Vaccination in Children

Children are particularly vulnerable to infectious diseases because their immune systems are still developing. Therefore, the first vaccines are given shortly after birth.

Important Childhood Vaccines

1. BCG Vaccine (Bacillus Calmette–Guérin)

Given: At birth

Prevents: Tuberculosis (TB)

Tuberculosis is a bacterial infection that primarily affects the lungs but can also damage the brain and bones in children.

Consequences of not taking the BCG Vaccine

• Severe TB infections
• TB meningitis
• Long-term disability or death

2. Hepatitis B Vaccine

Given: At birth and additional doses in infancy

Prevents: Hepatitis B infection

Hepatitis B attacks the liver and may lead to chronic liver disease.

Consequences of not taking the Hepatitis B Vaccine

• Liver failure
• Liver cancer
• Chronic hepatitis infection

3. Polio Vaccine (OPV/IPV)

Given: Multiple doses during infancy and early childhood

Prevents: Poliomyelitis

Polio is a viral infection that attacks the nervous system and can cause paralysis.

Consequences of not taking the Polio Vaccine

• Permanent paralysis
• Breathing difficulties
• Death in severe cases

4. DPT Vaccine

Prevents three diseases

• Diphtheria
• Pertussis (Whooping cough)
• Tetanus

Consequences of not taking the DPT Vaccine

Diphtheria

• Severe throat infection
• Heart damage

Pertussis

• Severe coughing spells
• Brain damage in infants

Tetanus

• Muscle stiffness
• Painful spasms
• High mortality

5. Measles Vaccine

Prevents: Measles

Measles is a highly contagious viral disease.

Consequences of not taking the Measles Vaccine

• Pneumonia
• Brain swelling (encephalitis)
• Blindness
• Death

6. Pneumococcal Vaccine

Prevents: Pneumonia, meningitis, and blood infections.

Consequences of not taking the Pneumococcal Vaccine

• Severe pneumonia
• Brain infection
• Hearing loss

7. Rotavirus Vaccine

Prevents: Severe diarrhoea in infants.

Consequences of not taking the Rotavirus Vaccine

• Severe dehydration
• Hospitalization
• Death in severe cases

Vaccination in Adolescents

As children grow into teenagers, additional vaccines are recommended to maintain immunity and protect against new risks.

Some of them include;

1. HPV Vaccine (Human Papillomavirus)

Recommended for: Boys and girls from ages 9–14.

Prevents

• Cervical cancer
• Anal cancer
• Throat cancer
• Genital warts

HPV is responsible for the majority of cervical cancer cases worldwide.

2. Tdap Booster

A booster dose is given during adolescence to maintain protection against:

• Tetanus
• Diphtheria
• Pertussis

Immunity from childhood vaccines decreases over time, making booster doses very necessary.

Vaccination for Adult Women

Vaccination plays an especially important role in women’s health because certain infections not only affect the woman herself but may also harm future pregnancies and newborn babies. Women require specific vaccines to protect against infections that can lead to cancers, infertility, pregnancy complications, or severe illness.

Ensuring that women receive appropriate vaccines throughout their lives is therefore a critical component of preventive healthcare.

Some of the vaccines every adult woman should take include;

1. Human Papillomavirus Vaccine (HPV)

The Human Papillomavirus (HPV) vaccine is one of the most important vaccines for women. HPV is a common sexually transmitted infection responsible for the majority of cervical cancer cases worldwide.

The vaccine is most effective when given between the ages of 9 and 14, but it can also be administered to older women who were not previously vaccinated.

Diseases prevented

• Cervical cancer
• Vaginal cancer
• Vulvar cancer
• Anal cancer
• Genital warts

Importance Of The Human Papillomavirus vaccine

Cervical cancer remains one of the leading causes of cancer-related deaths among women, particularly in developing countries. HPV vaccination significantly reduces the risk of developing cervical cancer later in life.

Consequences of not taking the Human Papillomavirus Vaccine

• Increased risk of cervical cancer
• Risk of other HPV-related cancers
• Development of genital warts

Regular cervical screening combined with HPV vaccination provides the most effective protection against cervical cancer.

2. Hepatitis B Vaccine (HBV)

Women who are not vaccinated against Hepatitis B remain at risk of infection through sexual contact, blood exposure, or from infected medical instruments.

Importance of Hepatitis B Vaccine for women

Hepatitis B infection during pregnancy can be transmitted from mother to child, resulting in chronic infection in newborns.

Diseases prevented

• Chronic hepatitis
• Liver cirrhosis
• Liver cancer

Consequences of not taking the Hepatitis B Vaccine

• Chronic liver disease
• Increased risk of liver cancer
• Transmission of infection to newborn babies

3 Tetanus Toxoid Vaccine (TT)

The tetanus toxoid vaccine is extremely important for women of reproductive age.

Tetanus bacteria enter the body through wounds or injuries. In pregnant women and newborn babies, tetanus infection can occur due to poor hygiene during delivery or umbilical cord care.

Importance of Tetanus Toxoid Vaccine

for women

Tetanus vaccination protects both the mother and the newborn baby from infection.

Diseases prevented

• Maternal tetanus
• Neonatal tetanus

Consequences of not taking the Tetanus Toxoid Vaccine

• Severe muscle spasms
• Breathing difficulty
• High mortality in newborn babies

In many countries, pregnant women receive multiple doses of tetanus toxoid during antenatal care to ensure adequate protection.

4. Rubella Vaccine

Rubella, also known as German measles, is generally a mild illness in adults but can cause severe complications when infection occurs during pregnancy.

Importance of Rubella Vaccine for women

Rubella infection during early pregnancy can result in congenital rubella syndrome.

Possible complications for the baby

• Congenital heart defects
• Blindness
• Deafness
• Intellectual disability
• Miscarriage or stillbirth

Vaccination before pregnancy is the most effective way to prevent these complications.

5. Influenza Vaccine

Pregnant women and women with chronic health conditions are particularly vulnerable to severe influenza infection.

Influenza vaccination during pregnancy protects both the mother and the baby during the first few months after birth.

6. COVID-19 Vaccine

COVID-19 vaccination is recommended for adult women, including pregnant and breastfeeding mothers, to reduce the risk of severe illness.

The vaccine helps prevent hospitalization and serious complications associated with the virus.

7. Pneumococcal Vaccine

Women with weakened immune systems, chronic illnesses, or those above 50 years of age may benefit from pneumococcal vaccination to prevent severe bacterial infections.

Vaccination During Pregnancy

Pregnant women are recommended certain vaccines to protect both mother and baby some of them include;

1. Tetanus Toxoid (TT)

Protects newborn babies from neonatal tetanus.

2. Influenza Vaccine

Pregnant women are more vulnerable to severe influenza infections.

Vaccination reduces the risk of complications and protects the newborn after birth.

Vaccination for Adult Men

Vaccination should continue throughout adulthood and mRN should not be left out. Some of the important vaccines men should get later in life include;

1. Influenza Vaccine

This vaccine is recommended annually to protect against seasonal flu.

2. Hepatitis B Vaccine

It Protects adults at risk of liver infection.

3. COVID-19 Vaccine

It Protects against severe complications from coronavirus infection.

4. Pneumococcal Vaccine

It is recommended especially for older adults and people with chronic illnesses.

5. Shingles Vaccine

It protects older adults from herpes zoster infection.

Every adult should receive recommended vaccines even if they missed childhood immunizations or not.

Consequences of Not Taking Vaccines

Failure to vaccinate can have serious consequences for individuals and society.

1. Increased Risk of Severe Disease

Without vaccines, individuals remain vulnerable to infections that can cause lifelong disability or death.

2. Disease Outbreaks

When many people remain unvaccinated, diseases can spread quickly through communities.

3. Higher Child Mortality

Many childhood deaths in developing countries are caused by vaccine-preventable diseases.

4. Economic Burden

Treating infectious diseases can impose significant financial costs on families and healthcare systems.

5. Risk to Vulnerable Populations

Unvaccinated individuals may spread diseases to:

• newborn babies
• elderly people
• individuals with weakened immune systems.

Vaccination protects both the individual and the wider community.

The Importance of Following the Immunization Schedule

Health experts design vaccination schedules carefully to ensure vaccines are given when the immune system can respond most effectively. Delaying vaccines leaves children vulnerable to diseases during critical developmental periods.  Following the recommended schedule ensures:

• early protection against diseases
• stronger immune response
• reduced risk of outbreaks.

Nurses Insight

Vaccination remains one of the most effective tools in modern medicine for preventing infectious diseases. From infancy to adulthood, immunization protects individuals against life-threatening illnesses such as polio, measles, hepatitis, tetanus, and cervical cancer.

For children, vaccines provide essential protection during their most vulnerable years. For adults, booster doses and additional vaccines maintain immunity and prevent emerging health risks. For pregnant women, vaccination safeguards both mother and child.

Failure to vaccinate not only endangers the individual but also threatens public health by allowing preventable diseases to spread. Ensuring widespread access to immunization and educating communities about its benefits is therefore essential for building a healthier society.

Vaccination is not something we should take for granted because it does not merely protect individuals—it protects entire generations.

 

Stephanie Nwakaegho, Gentechnews Health Columnist can be reached via thestephanienwakaegho@gmail.com