World Immunization Week
|World Immunization Week|
|Observed by||All member states of the World Health Organization|
|Date||Last week of April|
World Immunization Week is a global public health campaign to raise awareness and increase rates of immunization against vaccine-preventable diseases around the world. It takes place each year during last week of April.
Immunization can protect against 25 different infectious agents or diseases, from infancy to old age, including diphtheria, measles, pertussis, polio and tetanus. The World Health Organization (WHO) estimates active immunization currently averts 2 to 3 million deaths every year. However 22.6 million infants worldwide are still missing out on basic vaccines, mostly in developing countries. Inadequate immunization coverage rates often result from limited resources, competing health priorities, poor management of health systems and inadequate surveillance. The goal of World Immunization Week is to raise public awareness of how immunization saves lives, and support people everywhere to get the vaccinations needed against deadly diseases for themselves and their children.
World Immunization Week sprung out of the efforts taking place across different countries and regions for a week-long immunization awareness commemoration. World Immunization Week is one of eight official campaigns marked by the WHO, along with World Health Day, World Blood Donor Day, World No Tobacco Day, World Tuberculosis Day, World Malaria Day, World Hepatitis Day and World AIDS Day.
The World Health Assembly endorsed World Immunization Week during its May 2012 meeting. Previously, Immunization Week activities were observed on different dates in different regions of the world. Immunization Week was observed simultaneously for the first time in 2012, with the participation of more than 180 countries and territories worldwide.
Each World Immunization Week focuses on a theme. Previous themes have included the following: 
- 2014: “Are you up-to-date?”
- 2013: "Protect your world – get vaccinated"
- 2012: "Protect your world – get vaccinated"
The 2015 World Immunization Week theme is "Close the immunization gap" 
- health promotion
- World Health Day
- European Immunization Week
- Vaccination Week In The Americas
- Every Child By Two, United States
- Universal Immunization Programme, India
- World Health Organization, Immunization coverage. WHO Fact sheet N° 378, updated February 2014. Accessed 9 April 2014.
- World Health Organization, WHO campaigns. Accessed 9 April 2014.
- World Health Organization, World Immunization Week essentials. Accessed 9 April 2014.
- Canadian Public Health Association, The World’s First “World Immunization Week”. Accessed 9 April 2014.
- US Centers for Disease Control and Prevention, World Immunization Week. Accessed 9 April 2014.
- World Health Organization, World Immunization Week 2014. Accessed 9 April 2014.
- World Health Organization,  Accessed 18 Feb 2015.
- World Health Organization campaigns, official site