The prevalence of Ascariasis.
The common roundworm, Ascaris lumbricoides, is probably the most prevalent human intestinal helminth. Previous estimates of world prevalence range from around 650 million to 1000 million. By a detailed literature search, David Crompton now confirms the upper figure - estimating a world prevalence of 1008 million representing about 22% of the world population. The infection is known from 153 out of 218 recognized countries.
Department of Zoology, University of Glasgow Glasgow G 12 8QQ, UK.
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