PARASITIC INFECTIONS (MALARIA, LEISHMANIASIS, AMEBIASIS)

Abstract

Parasitic infections are a group of complex infectious diseases caused by protozoan parasites that affect multiple organ systems and lead to severe systemic pathology. This article provides an extensive and in-depth scientific analysis of malaria, leishmaniasis, and amebiasis, focusing on their etiology, pathogenesis, morphological alterations, immune response mechanisms, clinical progression, complications, and molecular pathological processes. Based on authoritative sources such as Robbins Pathology, Gray’s Anatomy, Harrison’s Principles of Internal Medicine, WHO, CDC, and NCBI, it is demonstrated that the main pathogenic mechanisms include intracellular invasion, parasite replication, immune evasion, oxidative stress induction, and progressive tissue destruction.