الفهرس يوجد فقط 14 صفحة متاحة للعرض العام
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المستخلص
Cryptosporidium is an obligate, intracellular, coccidian parasite with a complex life cycle including sexual and asexual replication. Thick- walled oocysts with a diameter of 4{u2013}6mm are shed in faeces of infected persons. The genus Cryptosporidium has about eight species, of which Cryptosporidium parvum is responsible for most human infection, although other species can cause illness. There are nearly 61 Cryptosporidium genotypes with uncertain species status have been found based on small subunit (SSU rRNA) sequence. Cryptosporidium is one of the best examples of 2emerging disease3-causing organisms. It was discovered to infect human in 1976, and waterborne transmission was confirmed for the first time in 1984. Cryptosporidiosis is a zoonotic disease which caused by the protozoan parasite Cryptosporidium, it has world wide distribution and in the most surveys it is considered to be among the four major pathogens causing diarrheal diseases in children.It has major public health implications because infection can result from exposure to low number of Cryptosporidium oocysts. The oocysts are highly resistant to chlorination and common household disinfectants, ability to pass through physical water treatment processes, and survive long periods in the environment. Human can acquire Cryptosporidium infection through several transmission routes, such as direct contact with infected persons or animals,and ingestion of contaminated food (food borne transmission) and water (waterborne transmission)