Protozoa microorganism can be spread by a mosquito bite or by consuming contaminated water.
- Despite being assigned to the kingdom Animalia in the classical classification scheme, the Protozoa are now regarded as a subkingdom of the kingdom Protista. Protozoa have been classified into more than 50,000 species, the majority of which are free-living organisms. They can be found almost anywhere protozoa existed in the Pre-Cambrian era, as evidenced by the fossil record of shells in sedimentary rocks.
- Using microscopes he made from basic lenses, Anton van Leeuwenhoek was the first to see protozoa. Protozoan illnesses can range from being extremely minor to being fatal. People whose immune systems can only contain a parasite infection temporarily become carriers and serve as a source of infection for others.
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