Health & Wellness
From Smallpox to Polio: Diseases Gen Z Has Rarely Seen, Thanks to Vaccines
During World Immunization Week (April 24–30), the spotlight turns to one of the most powerful tools in modern medicine—vaccination.
Not long ago, infectious diseases shaped entire generations. They caused widespread deaths, lifelong disabilities, and global fear. Today, however, many people from Gen Z have never encountered these illnesses firsthand—not because they vanished naturally, but because vaccines have dramatically reduced or eliminated them.
Over the past century, immunisation programmes have transformed global public health, saving millions of lives and redefining what “normal” health looks like.
🌍 How Vaccines Changed the World
Vaccines work by training the immune system to recognise and fight infections before they become dangerous. Thanks to widespread immunisation:
- Some diseases have been eradicated completely
- Others are close to elimination
- Many are now rare or controlled in most countries
This progress highlights why continued vaccination efforts remain critical.
🦠 8 Diseases Gen Z Has Largely Been Shielded From
1. Smallpox
Smallpox was once among the deadliest diseases in human history, killing millions over centuries.
- First vaccine developed in 1796
- Officially eradicated in 1980
It remains the only human disease ever completely eradicated through vaccination.
2. Polio
Polio once paralysed thousands of children every year.
- First effective vaccine introduced in 1955
- Now nearly eradicated globally
Today, cases are limited to a few regions, thanks to sustained vaccination campaigns.
3. Measles
Measles used to cause frequent outbreaks, especially among children.
- Vaccine introduced in 1963
- Cases have dropped dramatically worldwide
However, outbreaks can still occur where vaccination rates decline.
4. Mumps
Mumps caused fever, swelling, and potential complications.
- Vaccine introduced in 1967
- Later included in the MMR vaccine (1971)
Now largely controlled in vaccinated populations.
5. Rubella (German Measles)
Rubella posed serious risks during pregnancy.
- Vaccine introduced in 1969
- Prevents miscarriages and birth defects
Widespread vaccination has significantly reduced congenital rubella syndrome.
6. Hepatitis B
Hepatitis B can lead to chronic liver disease and cancer.
- Vaccine introduced in 1981
- Now part of routine immunisation in many countries
It has greatly reduced transmission, especially from mother to child.
7. Haemophilus influenzae type b (Hib)
Haemophilus influenzae type b once caused severe illnesses like meningitis in children.
- Vaccine introduced in the late 1980s
- Cases dropped sharply after immunisation
It is now rare in countries with strong vaccination programmes.
8. Tetanus
Tetanus is caused by bacteria found in soil and wounds.
- Preventable through routine vaccination
- Now rare in many parts of the world
Unlike others, it hasn’t been eradicated, but is effectively controlled.
⚠️ Why Vaccination Still Matters
Even though these diseases are rare today, they haven’t disappeared entirely. Lower vaccination rates can lead to:
- Disease outbreaks
- Increased health risks for children
- Re-emergence of controlled infections
That’s why initiatives like World Immunization Week continue to raise awareness about the importance of vaccines.
🧠 Final Take
The fact that Gen Z has grown up largely without witnessing diseases like Smallpox or Polio is not accidental—it’s the result of decades of scientific progress and global cooperation.
Vaccines haven’t just saved lives—they’ve reshaped entire generations. The challenge now is to maintain that progress by ensuring immunisation reaches everyone, everywhere.