How does Plasmodium falciparum infect such a large number of red blood cells?

The high virulence of Plasmodium falciparum is largely attributed to its ability to infect a significantly higher proportion of red blood cells compared to other malaria-causing species. Patients infected with P. falciparum often exhibit ten times the number of parasites per cubic millimeter of blood than those infected with other species.1

This high level of infection is sustained by the parasite's rapid reproductive cycle. After invading red blood cells, the parasite grows and divides, eventually causing the cell to rupture and release a new generation of merozoites into the bloodstream to infect additional cells.12

Furthermore, P. falciparum has evolved mechanisms to evade the host's immune system. The parasite synthesizes specific proteins that make infected red blood cells "sticky," causing them to adhere to the walls of capillaries. This adherence prevents the infected cells from being transported to the spleen, where they would otherwise be destroyed, thereby allowing the parasite to persist and continue its cycle of infection.13