World Vaccination Week Start › News < back 24 Apr 2026 World Vaccination Week is marked as an initiative promoted by the World Health Organization, aiming to highlight the importance of vaccination in protecting both individual and public health. Vaccines are one of the most effective public health measures, preventing serious diseases and significantly reducing mortality worldwide. Thanks to immunization, many diseases have been controlled and, in some cases, eradicated. Vaccination not only protects those who receive it but also the wider community by contributing to herd immunity and safeguarding the most vulnerable. Marking this week reinforces the importance of keeping vaccination schedules up to date and trusting scientific evidence, promoting health and preventing outbreaks of preventable diseases. Vaccines save lives.