World Immunization Week

World Immunization Week: A Global Call to Action

World Immunization Week is an annual public health campaign celebrated during the last week of April (April 24–30). Its primary goal is to raise awareness about the importance of vaccines in protecting people from preventable diseases and saving millions of lives globally.

Quick Facts

When is it? April 24–30 annually.
Tagged as: A WHO global health campaign.
What’s the hashtag? #VaccinesWork.
When was it founded? 2012.
Who founded it? The World Health Assembly.

History

World Immunization Week was officially endorsed in May 2012 by the World Health Assembly. Before its global unification, immunization awareness weeks were observed at different times across various regions. The campaign builds on centuries of vaccine development, starting with Edward Jenner’s invention of the smallpox vaccine in 1796. It celebrates milestones like the eradication of smallpox and progress against polio, measles, and other diseases.

Timeline

1796: Edward Jenner develops the smallpox vaccine.
1892: Haffkine creates vaccines for cholera and bubonic plague.
1955: Jonas Salk introduces the inactivated polio vaccine.
2006: FDA approves the HPV vaccine.
2022: WHO launches “The Big Catch-Up” campaign post-COVID disruptions.

Upcoming Dates

Year	Month and Date	Day
2025	April 24–30	Thursday–Wednesday
2026	April 24–30	Friday–Thursday
2027	April 24–30	Saturday–Friday
2028	April 24–30	Monday–Sunday
2029	April 24–30	Tuesday–Monday
2030	April 24–30	Wednesday–Tuesday

Observed

World Immunization Week is observed globally, involving governments, healthcare organizations, and communities to promote vaccine awareness and accessibility.

Fun Facts About Vaccines

Vaccines prevent over 25 diseases, including measles, polio, and COVID-19.
Immunization saves up to 3 million lives annually worldwide.
Smallpox is the only disease eradicated through vaccines.

Quiz

Who developed the first vaccine?
- Answer: Edward Jenner.
What disease was eradicated by vaccination?
- Answer: Smallpox.
When was World Immunization Week founded?
- Answer: 2012.

FAQs

Q: How do vaccines work?
A: Vaccines stimulate the immune system to recognize and fight specific pathogens.

Q: Why are vaccines important?
A: They protect individuals and communities from deadly diseases.

Q: What vaccines should adults get?
A: Adults need vaccines for flu, hepatitis A and B, chickenpox, and more.

Importance of World Immunization Week

This campaign highlights the life-saving power of vaccines, encourages global collaboration to increase immunization coverage, and addresses barriers like vaccine hesitancy and unequal access.