医学原虫Medical ProtozoaEntamoebahistolyticaLeishmaniaGiardiaintestinalis-Toxoplasma gondiiPlasmodiumTrichomonasvaginalisBalantidium coliPneumocystisCryptosporidium
Protozoa are one-celled animals foundworldwide in most habitats. Most species arefree living, but all higher animals are infectedwith one or more species of protozoa
Protozoa are one-celled animals found worldwide in most habitats. Most species are free living, but all higher animals are infected with one or more species of protozoa
Basic structure1. Cell membrane2. Cytoplasmorganelles: pseudopodium; flagellum;cilium3. Nucleus: two kinds of nucleivesicular;compact
Basic structure 1. Cell membrane 2. Cytoplasm organelles: pseudopodium; flagellum; cilium 3. Nucleus: two kinds of nuclei: vesicular; compact
Schematic diagram of a protozoan cellNuclearmembranekaryosomeendoplasmenectoplasmecnVesicular nuclearCellmembraneEC.FChromatinbeadsAchromaticfibrils
LifeCycle Stages The stages of parasitic protozoa that actively feedand multiply are frequently called trophozoites; insome protozoa, other terms are used for thesestages.Cysts are stages with a protective membrane orthickened wall
Life Cycle Stages • The stages of parasitic protozoa that actively feed and multiply are frequently called trophozoites; in some protozoa, other terms are used for these stages. • Cysts are stages with a protective membrane or thickened wall