Malaria was once prevalent in Europe and the USA in the early 1900s but was successful eliminated from these areas. However, malaria is still prevalent in the tropical regions i.e. parts of Asia, Africa and South America. Is it correct to say that Malaria is a disease of poverty? What biological factors make it so hard to treat Malaria.

Malaria was once prevalent in Europe and the USA in the early 1900s but was successful eliminated from these areas. However, malaria is still prevalent in the tropical regions i.e. parts of Asia, Africa and South America. Is it correct to say that Malaria is a disease of poverty? What biological factors make it so hard to treat Malaria.