In 2009, about 3.3 billion people - half of the world's population - were at risk of malaria. Every year, this leads to about 250 million malaria cases and nearly 800 thousand deaths. People living in the poorest countries are the most vulnerable. World Malaria Day - which was instituted by the World Health Assembly at its 60th session in May 2007 - is a day for recognizing the global effort to provide effective control of malaria.
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