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 (WHO). It focuses on a different health theme each year, with 2014 highlighting vector-borne diseases. Events are organized worldwide by governments, NGOs, and health organizations to educate the public and encourage prevention of diseases. The WHO works to address health issues globally and has helped reduce diseases like smallpox, polio, and others in developing nations.