Experimental Plasmodium falciparum cerebral malaria in the squirrel monkey Saimiri sciureus

Area of Science:

• * Infectious Diseases
• * Parasitology
• * Primate Models

Background:

• * Plasmodium falciparum causes severe human malaria, including cerebral malaria.
• * Developing reliable animal models is crucial for studying cerebral malaria pathogenesis and testing therapeutics.
• * Squirrel monkeys (Saimiri sciureus) are susceptible to Plasmodium infections.

Purpose of the Study:

• * To establish and characterize a simian model of cerebral malaria using Plasmodium falciparum.
• * To investigate the development of neurological symptoms in infected squirrel monkeys.

Main Methods:

• * Infection of squirrel monkeys with three different strains of Plasmodium falciparum: Palo Alto (FUP-1), Palo Alto PLF3 (MHB11), and IPC/RAY.
• * Observation of neurological symptoms and outcomes in both splenectomized and non-splenectomized animals.
• * Monitoring of parasitemia levels and infection duration.

Main Results:

• * A proportion of infected squirrel monkeys developed neurological symptoms, leading to a fatal outcome, establishing a model for human cerebral malaria.
• * Cerebral malaria occurred in both splenectomized and non-splenectomized monkeys.
• * The onset of neurological symptoms was unpredictable and not correlated with parasitemia or infection duration.

Conclusions:

• * Squirrel monkeys provide a valuable simian model for studying human cerebral malaria.
• * The development of cerebral malaria in this model is complex and not solely dependent on parasitemia or splenectomy status.
• * Further research is needed to understand the mechanisms underlying unpredictable neurological manifestations.