Three types of parasites can cause disease in humans. They are protozoa, carried by mosquitos, helminths, such as roundworm, and ectoparasites, for instance lice and bed bugs. Parasites are organisms ...
DURING recent years, there has been increasing amount of evidence regarding the importance of protozoa in the aerobic purification of sewage 1–4 and, more recently, some quantitative observations on ...
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