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Cause of Protozoa- parasitic infections in humans are usually in the size range of 1-100 micrometres (millionths of a metre) and have two stages in life cycle.

*Infection is usually spread by structures called cysts which are cells that have secreted a protective layer around them so that they can survive the journey from one host to the next. Once inside the new host, these cysts develop into the active protozoa which grows, reproduces and causes symptoms of disease in the new host.

*Common infections caused in humans are amoebic dysentery, sleeping sickness and malaria.

*Protozoa can infect any human tissue, and are the cause of a variety of diseases.

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