April 24 - 30: World Immunization Week 2019 Celebrated in the last week of April, World Immunization Week aims to promote the use of vaccines to protect people of all ages against disease. Immunization saves millions of lives every year and is widely recognized as one of the world’s most successful and cost-effective health interventions. The theme of this year’s campaign is Protected Together: Vaccines Work! and the campaign will celebrate Vaccine Heroes from around the w