Malaria is a life-threatening disease caused by parasites that are transmitted to people through mosquito bites. China used to report 30 million cases a year during the 1940s. Since then, eradication efforts have been made to drive down case numbers using various methods to break the cycle of transmission. These methods include using anti-malarial drugs, spraying mosquito breeding grounds, and distributing insecticide-treated nets. The World Health Organization (WHO) recently said that the country had now gone four years without registering a case, giving it malaria-free certification. After a 70-year effort to wipe it out, WHO has declared China malaria-free. China has now become the 40th country to be declared malaria-free.