The Biology of Malaria Parasite Liver Infection

The Plasmodium liver stages of infection-initiated when mosquito-transmitted sporozoites invade hepatocytes-are asymptomatic and essential for initial parasite replication and progression to blood stage infection. This paper provides an overview of liver stage biology, from sporozoite invasion mechanisms and host hepatocyte remodeling to intracellular development, nutrient acquisition, and evasion of host defenses. We highlight recent insights into cellular and molecular host-parasite interactions, and innate immune pathways that mediate liver stage clearance. The paper also reviews the evolution and clinical progress of pre-erythrocytic whole parasite vaccines, which are deeply rooted in an understanding of liver stage biology. As they constitute the initial phase of infection, the liver stages are a critical target for malaria prevention and a focal point for next-generation interventions that aim at malaria elimination.