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much higher

Entamoeba histolytica

400 but may be much higher

Cryptosporidium spp.

?

Data from Crompton, DWT (1999) How much human helminthiasis is there in the world? Journal of Parasitology 85: 397-403; Olsen BE, Olson ME, and Wallis PM (2002) Giardia: The Cosmopolitan Parasite. Wallingford, UK: CABI; Haque R et al. (2003) Current concepts: amebiasis. New England Journal of Medicine 348: 1565-1573.

nutrient loss, particularly of iron and protein, it is believed that such low-level but long-term infections contribute to the persistently poor nutritional state of many, especially children, in the developing world.

The most important parasites of man are from two main groups: the helminth worms and protozoans. Although several hundred different species have been described, the vast majority of infections are caused by relatively few.

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