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Epidemiological aspects of intestinal parasitosis in Ethiopian immigrants

, : Epidemiological aspects of intestinal parasitosis in Ethiopian immigrants. Harefuah 115(1-2): 1-5

Epidemiological analysis of results of stool examinations of 2,288 Ethiopian immigrants showed that the age distributions of different parasites sharing a common mode of transmission were generally similar. Thus, Ascaris lumbricoides and Trichuris trichiura (indirect transmission by eggs) were most prevalent in young adults, while Schistosoma mansoni and Necator americanus (transmitted by infective larvae) were both prevalent throughout adulthood. Among parasites with a direct mode of transmission, Entamoeba coli was an exception, as its prevalence increased continuously with age, while Hymenolepis nana and Giardia lamblia were most prevalent in children. The general prevalence of intestinal parasites, as well as the prevalence of mixed infestations increased with age. The parasites most frequently found in mixed infestations with 2 or 3 helminth species were N. americanus, S. mansoni, A. lumbricoides, H. nana and T. trichiura (in decreasing order of frequency). Calculations of relative risk of infestation with parasites in double infestations demonstrated a positive relationship between A. lumbricoides and T. trichiura and between N. americanus and S. mansoni. There was a negative relationship between H. nana and A. lumbricoides and T. trichura. The intensity of infestations with intestinal helminths is generally low. The effect of the change to different living conditions in Israel on the prevalence of intestinal helminthiasis was particularly dramatic with A. lumbricoides, which practically disappeared 6 months after immigration, and with H. nana, which increased considerably in children residing in Israel over 6 months.

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Accession: 005375119

PMID: 3138168

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