Snail intermediate host/Schistosoma haematobium relationships from three transmission sites in Benin (West Africa).
ABSTRACT The relationships between three strains of Schistosoma haematobium (Doh, Sô-Tchanhoué and Toho-Todougba; from Benin, West Africa) and their snail hosts were assessed by measurement of several life-history traits, including the infection rate; pre-patent period; cercarial production of each parasite strain; and growth, fecundity and survival of the host snails. Adaptations to its local snail host was found for the Toho-Todougba strain and included a short pre-patent period, a long patent period and production of more cercariae in its local snail host. In contrast, the life-history traits of the Doh and Sô-Tchanhoué strains indicated non-local adaptations, as some sympatric host-parasite combinations were not compatible, the highest infection rates occurred in the allopatric snail Bulinus wrighti, and the duration of cercarial production was short because of the high level of mortality of the snails. Furthermore, snail reproduction ceased following infection by each of the three parasite strains, and the life-history traits were not influenced by the miracidial dose.
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Article: Welcome to parasites & vectors.Parasites & Vectors 02/2008; 1(1):1. · 3.25 Impact Factor
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ABSTRACT: Newborn Planorbarius metidjensis (less than 72 h of life) were individually exposed to one, two, or five miracidia of Schistosoma haematobium to assess how the quantity of miracidia would affect the shedding of cercariae. The infection rate of snails increased as the number of miracidia increased (from 17% to 87% at 24-26 degrees C). The prepatent period was significantly shorter in planorbids exposed to a single miracidium (38 days) than in the two groups infected with two or five miracidia per snail (51-53 days). No significant difference was noted between the mean values recorded for the three groups in terms of the patent-period duration (48-70 days), the total number of cercariae (1,570-1,935/snail), and size at snail death (5.4-6 mm). A rhythm was detected in the daily production of cercariae from P. metidjensis; however, its periodicity differed according to the snail group (15-16, 20-23, and 25-27 days for the groups infected with one, two, and five miracidia, respectively.Parasitology Research 02/1996; 82(3):267-9. · 2.85 Impact Factor
- Journal of Helminthology 02/1972; 46(2):185-99. · 1.16 Impact Factor