excystation of mature entamoeba histolytica cysts occurs in the digestive tract.
excystation of mature entamoeba histolytica cysts occurs in the digestive tract.
where does excystation of mature entamoeba histolytica cysts occur?
digestive tract
the active (trophozoite) stage exists only in the host and in fresh loose feces; cysts survive outside the host in water, in soils, and on foods, especially under moist conditions on the latter. the infection can occur when a person puts anything into their mouth that has touched the feces of a person who is infected with "e. histolytica", swallows something, such as water or food, that is contaminated with "e. histolytica", or swallows "e. histolytica" cysts (eggs) picked up from contaminated surfaces or fingers. the cysts are readily killed by heat and by freezing temperatures, and survive for only a few months outside of the host. when cysts are swallowed they cause infections by excysting (releasing the trophozoite stage) in the digestive tract.
entamoeba histolytica
to diagnosis for "e. coli", a stool sample is usually tested. this is the best method to check to see if the parasite is "e. coli" and not "e. histolytica". this usually involves checking the cysts for the size, shape, and the number of nuclei. "e. coli" has cysts in size to 10 to 35 micrometers, the shape is irregular, oval with a shell-like appearance that is more uniformed compared to "e. histolytica", and has up to eight nuclei in the cyst compared to the four nuclei of "e. histolytica". to the untrained eye of by inexperienced microbiologists, "tetranucleate cysts of "entamoeba coli" can be mistaken for mature cysts of "entamoeba histolytica"" often " a tetranucleate "entamoeba coli" cyst is larger than a mature cyst of "entamoeba histolytica", can be variable in shape, and has nuclear peripheral chromatin and karyosome composed of irregular granules" in this matter of comparison.
entamoeba coli