Malaria is one of the most common (1)____ diseases in the world. So far the only kind of (2)____ implemented by the affected

Malaria is one of the most common infection diseases in the world. So far the only kind of prevention implemented by the affected countries has been distributing mosquito nets and basic medicines. Scientists and doctors have been working on a malaria vaccine for many years. However, although all vaccines produced so far have shown good results on monkeys their effectiveness  in tests on humans was far less impressive. Research on the malaria vaccine arouses considerable interest in African, Asian, and South American countries, where malaria is economically a most dangerous disease causing patients\' loss of life and economic problems. Everybody is then patiently waiting for good news about successful trails of a new medicine as the future costs of malaria spreading are indeed unpredictable.