Control of schistosomiasis by use of biological control of snail hosts with special reference to competition

Frandsen, Flemming

doi:10.1590/s0074-02761987000800022

Cited by 7 publications

(2 citation statements)

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“…Fluke's development in intermediate host depends on genetic factors likewise environmental factors, which might facilitate eggs and miracid dispersion 13,14,42 . The competition among larvae from different trematode species inside mollusk can reduce both parasite number and snails population 3,16,20 . MACHADO et al 23 found that larvae S. mansoni did not develop in B. tenagophila previously infected by Longifurcate cercariae with or without eyespot.…”

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Schistosoma mansoni and other larval trematodes in Biomphalaria tenagophila (Planorbidae) from Guarulhos, São Paulo State, Brazil

Moraes

Silva

Ohlweiler

et al. 2009

Rev. Inst. Med. trop. S. Paulo

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suMMaryA total of 909 Biomphalaria tenagophila were collected from two areas in Guarulhos (Metropolitan area of São Paulo, São Paulo State, Brazil) to assess larval trematode infections. In all collection sites, only this species was found and 183 (20.13%) harbored trematode infections. In these collections, four morphologically distinguishable types of cercariae were identified by confocal microscopy. Xiphidiocercaria (Cercaria lutzi) was the most common type of cercaria recovered, contributing 76.5% of all infections. Schistosoma mansoni cercariae were recovered and comprised the total of 13.11%. Strigea cercaria (Cercaria caratinguensis) and Brevifurcate pharyngeate Clinostomatoide cercaria (Cercaria ocellifera) contributed 8.33% and 2.22% of all infections, respectively. Double infections (S. mansoni and C. lutzi) were found in twelve snails, contributing 6.55% of all infections. In all sites studied, small vertebrates were found in snail habitats and it was observed human contact with the water. The presence of trematode infected snails in large cities has public health implications. It further provides a starting point for some comprehensive studies on snail-related aspects of transmission and biology of trematode of medical and veterinary importance.

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confidence: 99%

Schistosoma mansoni and other larval trematodes in Biomphalaria tenagophila (Planorbidae) from Guarulhos, São Paulo State, Brazil

Moraes

Silva

Ohlweiler

et al. 2009

Rev. Inst. Med. trop. S. Paulo

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“…Laboratory studies of freshwater snail–trematode associations have demonstrated the presence of strong antagonistic interactions between the intra-molluscan of redia and sporocyst stages of species that infect the same host individual and that double infections are more pathogenic to the snails when compared to infections of only one trematode species (Lim and Heyneman, 1972; Sousa, 1992; Lafferty et al ., 1994). The competition among larvae from different trematode species inside mollusks can reduce both parasite number and the snail population (Basch et al ., 1969; Lim and Heyneman, 1972; Frandsen, 1987). Larvae of Schistosoma mansoni do not develop in B. tenagophila previously infected by longifurcate cercariae with or without an eyespot (Machado et al ., 1988).…”

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Population dynamics and diversity of trematode infections inBithynia siamensis goniomphalosin an irrigated area in northeast Thailand

et al. 2021

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Several trematodes including Opisthorchis viverrini utilize Bithynia siamensis goniomphalos as a snail intermediate host in their life cycles. In order to capture a comprehensive range of host–parasite interactions and their transmission dynamic patterns, B. s. goniomphalos were sampled monthly over 4 consecutive years in an irrigated paddy-field habitat in northeast Thailand. Using a standard cercarial shedding method, a high diversity of trematodes (17 types) was recovered. Virgulate xiphidiocercariae were the most prevalent (7.84%) followed by O. viverrini (0.71%). In addition to seasonal and environmental factors, the quantity of irrigation water for rice cultivation correlated with transmission dynamics of trematodes in B. s. goniomphalos. The peak prevalence of all trematode infections combined in the snails shifted from the cool-dry season in 2010–2012 to the hot-dry season in 2013 associated with an increasing quantity of water irrigation. A low frequency of mixed trematode infections was found, indicating that the emergence of virgulate cercariae, but not of O. viverrini, was negatively impacted by the presence of other trematodes in the same snail. Taken together, the observed results suggest that interactions between host and parasite, and hence transmission dynamics, depend on specific characteristics of the parasite and environmental factors including irrigated water for rice cultivation.

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Implementation of Human Schistosomiasis Control: Challenges and Prospects

Fenwick

Rollinson

Southgate

2006

Advances in Parasitology

143

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Control of schistosomiasis by use of biological control of snail hosts with special reference to competition

Cited by 7 publications

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Schistosoma mansoni and other larval trematodes in Biomphalaria tenagophila (Planorbidae) from Guarulhos, São Paulo State, Brazil

Schistosoma mansoni and other larval trematodes in Biomphalaria tenagophila (Planorbidae) from Guarulhos, São Paulo State, Brazil

Population dynamics and diversity of trematode infections inBithynia siamensis goniomphalosin an irrigated area in northeast Thailand

Implementation of Human Schistosomiasis Control: Challenges and Prospects

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