About 3.4 billion people – half of the world's population – are at risk of malaria. In 2012, there were about 207 million malaria cases (with an uncertainty range of 135 million to 287 million) and an estimated 627 000 malaria deaths (with an uncertainty range of 473 000 to 789 000). Increased prevention and control measures have led to a reduction in malaria mortality rates by 42% globally since 2000 and by 49% in the WHO African Region.

People living in the poorest countries are the most vulnerable to malaria. In 2012, 90% of all malaria deaths occurred in the WHO African Region, mostly among children under 5 years of age.

http://www.who.int/features/factfiles/malaria/en/

Not because today we have malaria and the next day it has been cured, doesn't mean everyone is can buy the medicine to cure themselves.
what more, malarias are getting resistant to insecticides

Key weapons in the fight against malaria, pyrethroid insecticides, are losing their edge. Over the past decade, billions of dollars have been spent on distributing long-lasting pyrethroid-treated bed nets and on indoor spraying. Focused in Africa, where most malaria deaths occur, these efforts have greatly reduced the disease's toll. But they have also created intense selection pressure for mosquitoes to develop resistance.

http://www.nature.com/news/2011/110705/full/475019a.html