P. vivax is a species of malaria-causing parasite that primarily infects humans. It is one of the most common types of malaria and is mainly found in tropical and subtropical regions. The parasite is transmitted through the bite of infected Anopheles mosquitoes, leading to symptoms such as fever, chills, and fatigue. Unlike some other malaria species, P. vivax can remain dormant in the liver, causing relapses after the initial infection has been treated. This ability makes it particularly challenging to eradicate. Effective treatment typically involves a combination of antimalarial medications to target both the blood and liver stages of the parasite's life cycle.