World Health Day is celebrated annually on April 7th to raise awareness of global health issues and support the work of the World Health Organization. It is marked by various events organized worldwide by governments, NGOs, and health organizations to educate the public and encourage individual and community action. The 2014 theme was "vector-borne diseases" like malaria and dengue fever, which rely on organisms like mosquitoes to spread from person to person. World Health Day aims to mobilize support for addressing serious health challenges faced globally and promote practices for maintaining individual and population health.