For a 2 micron cell diameter (a relatively large bacterium or a very small eukaryotic cell), the 4 nm thickness implies an aspect ratio of 1:500, similar to the case of an airplane.
Malaria is caused by the protozoan parasite Plasmodium. Human malaria is caused by four different species of Plasmodium: P. falciparum, P. malariae, P. ovale and P. vivax. Humans occasionally become infected with Plasmodium species that normally infect animals, such as P. knowlesi.
Human malaria is caused by four species of Plasmodium protozoa: Plasmodium falciparum, P.vivax, P. ovale and P.malariae. Malaria is a public health problem in over 100 countries worldwide, inhabited by some 40% of the world population, i.e. over 2 billion people.