Abstract
Foods may be involved in the spread of Giardia cysts (Table 1) not because the animal or plant source is a requisite host in the life cycle of the parasite, but because of circumstances that cause food contamination (Bier, 1981; Healy et al., 1976). Although the epidemiology of giardiasis appears to resemble that of amebiasis, it is not identical and is not as well documented. A comparison of Entamoeba histolytica and Giardia infections shows that age prevalence curves for E. histolytica infections nearly always indicate a steady level in adults, whereas with Giardia infections there is a marked age decline. Giardiasis is of relatively short duration and, at least in normal adults, rarely exceeds 3 months; in contrast, an E. histolytica infection may last for many years.
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Barnard, R.J., Jackson, G.J. (1984). Giardia lamblia. In: Erlandsen, S.L., Meyer, E.A. (eds) Giardia and Giardiasis. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-0594-9_21
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