1. The document summarizes key information about three protozoan parasites: Entamoeba histolytica, Giardia lambelia, and Trichomonas vaginalis.
2. It outlines the stages of infection for each parasite, including the trophozoite (invasive or adhesive stage) and cyst (infective stage).
3. The clinical symptoms caused by each parasite are described, such as amebic dysentery, diarrhea, vomiting, and inflammation. Treatment options including dosage amounts of drugs like metronidazole and albendazole are also listed.