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by heat and by freezing temperatures; they 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.The pathogenic nature of E. histolytica was first reported by Fedor A. Lösch in 1875, but it was not given its Latin name until Fritz Schaudinn described it in 1903. E. histolytica, as its name suggests (histo-lytic = tissue destroying), is pathogenic;

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