Eighty countries and territories will be participating in “vaccination week” campaigns in the Americas (25 April-2 May) and Europe (20-26 April). These campaigns against diseases such as influenza, measles, rotavirus, rubella and yellow fever are being combined with advocacy and social outreach activities to boost awareness of the importance of immunization. These annual initiatives focus on increasing immunization coverage, immunizing vulnerable and hard-to-reach populations as well as promoting the use of new and existing vaccines.

– Vaccination Week in the Americas
– European Immunization Week

http://www.who.int/immunization/newsroom/regions_unite_millions_vaccinated/en/index.html