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General Characteristics
Unicellular Eukaryotes
lack a cell wall
require a moist environment
They can exist as Trophozoites (active, feeding stage) or Cysts (dormant, infective stage).
Living in body cavities
– Blastocystis (diarrhoea)
– Entamoeba (dysenteria, abscesses)
Living in tissues
– Plasmodium (malaria)
– Pneumocystis (pneumonia)
Groups of Human Protozoal Infections
Amebae (Sarcodina): Move by pseudopods (e.g., Entamoeba histolytica - Amebiasis).
Flagellates (Mastigophora): Move by flagella (e.g., Giardia lamblia - Giardiasis; Trypanosoma - African Sleeping Sickness).
Sporozoa (Apicomplexa): Non-motile in adult stage, complex life cycles often involving vectors (e.g., Plasmodium - Malaria).
Ciliates (Ciliophora): Move by cilia (e.g., Balantidium coli).