Repeated focal mollusciciding for snail control in a sugar-cane area of northeast Brazil

Pieri, Otávio Sarmento; Gonçalves, José Felipe; Sarquis, Otília

doi:10.1590/s0074-02761995000400022

Cited by 19 publications

(15 citation statements)

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“…Since migration is likely to recur including migration against currents, the streams infested will have to undergo extensive treatment, encompassing larger regions than those where people usually has water contact. Despite the fact that niclosamide can exterminate 100% of snails, late follow-up surveys have confirmed that vectors will invariably re-infest areas approximately a month following treatment (Pieri et al 1995). Basing on the areas studied, Pieri has admitted that to maintain a low prevalence of schistosomiasis moluscicide application must be repeated monthly along with treatment of the infected people.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of the Molluscicidal Properties of Euphorbia splendens var. hislopii (N.E.B.) Latex: Experimental Test in an Endemic Area in the State of Minas Gerais, Brazil

Mendes

Vasconcellos

Baptista³

et al. 1997

Mem. Inst. Oswaldo Cruz

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Section: Discussionmentioning

confidence: 99%

Evaluation of the Molluscicidal Properties of Euphorbia splendens var. hislopii (N.E.B.) Latex: Experimental Test in an Endemic Area in the State of Minas Gerais, Brazil

Mendes

Vasconcellos

Baptista³

et al. 1997

Mem. Inst. Oswaldo Cruz

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“…The population is primarily urban; however, the economic activities are predominantly rural, such as subsistence and cash-crop agriculture, cattle ranching and aviculture. The region has a history of relatively high prevalence of persisting S. mansoni infection despite successive cycles of population surveys and treatment campaigns carried out by the MS from 1977-1995, which was prior to the decentralization of PCE (Pieri et al 1995. A total of 69 localities were covered in that period, varying from 26 in 1977 to 62 in 1995.…”

Section: Patients Materials and Methodsmentioning

confidence: 99%

Spatial distribution of Schistosoma mansoni infection before and after chemotherapy with two praziquantel doses in a community of Pernambuco, Brazil

Galvao

Favre

Guimarães

et al. 2010

Mem. Inst. Oswaldo Cruz

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Praziquantel chemotherapy has been the focus of the Schistosomiasis Control Program in Brazil for the past two decades. Nevertheless, information on the impact of selective chemotherapy against Schistosoma mansoni infection under the conditions confronted by the health teams in endemic municipalities remains scarce. This paper compares the spatial pattern of infection before and after treatment with either a 40 mg/kg or 60 mg/kg dose of praziquantel by determining the intensity of spatial cluster among patients at 180 and 360 days after treatment. The spatial-temporal distribution of egg-positive patients was analysed in a Geographic Information System using the kernel smoothing technique. While all patients became egg-negative after 21 days, 17.9% and 30.9% reverted to an egg-positive condition after 180 and 360 days, respectively. Both the prevalence and intensity of infection after treatment were significantly lower in the 60 mg/kg than in the 40 mg/kg treatment group. The higher intensity of the kernel in the 40 mg/kg group compared to the 60 mg/kg group, at both 180 and 360 days, reflects the higher number of reverted cases in the lower dose group. Auxiliary, preventive measures to control transmission should be integrated with chemotherapy to achieve a more enduring impact

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“…The high costs of synthetic molluscicides such as niclosamide, their toxicities to non-target aquatic biota and even man (Andrews et al, 1983;McCullough, 1992;Pieri et al, 1995;Rawi et al, 1996), as well as the complex organization required in their application, are a major setback to their continued use, especially in schistosomiasis control programmes. There is thus, the need for cheaper, environmentally friendly, biodegradable and readily available natural molluscicides from plants.…”

Section: Introductionmentioning

confidence: 99%

Effects of varying concentrations of the crude aqueous and ethanolic extracts of <i>Dalbergia sissoo</i> plant parts on <i>Biomphalaria pfeifferi</i> egg masses.

Adenusi¹,

Odaibo²

2010

Afr. J. Trad. Compl. Alt. Med.

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This study evaluated, using replicated laboratory bioassays, the toxicities of the crude aqueous and ethanolic extracts of Dalbergia sissoo Roxb. 1832 (family Leguminosae) fruits, leaves, roots and stem bark against egg masses of Biomphalaria pfeifferi (Krauss, 1848), the snail intermediate host of Schistosoma mansoni (Sambon, 1907) in Nigeria. Viable 0-24 hr-old embryonated egg masses were separately exposed to five different concentrations (7.81-2000 mg/l) of extracts for 24 hrs, washed in dechlorinated tap water and incubated at room temperature for a maximum of 4 weeks. The LC 50 and LC 90 values of test extracts for egg masses were calculated by probit analysis. The activities of the tested extracts were concentration-dependent. However, only the ethanolic extract of the fruits demonstrated significant activity (24 hr-LC 90 value < 100 mg/l: 89.29 mg/l). Mortalities of eggs were manifested at the gastrula/exogastrula and or the prehatch snail stage of development. The percentage of dead embryos at the prehatch snail stage decreased while the deaths of embryos at the gastrula/exogastrula stage increased, with increasing concentration of extract. Lethality of the ethanolic extract of D. sissoo fruits to embryonated egg masses of B. pfeifferi is an added advantage to its potential development for use as a plant molluscicide, as the overall efficacy of a molluscicide is greatly enhanced if it also shows significant toxicity towards snail eggs.

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Repeated focal mollusciciding for snail control in a sugar-cane area of northeast Brazil

Cited by 19 publications

References 0 publications

Evaluation of the Molluscicidal Properties of Euphorbia splendens var. hislopii (N.E.B.) Latex: Experimental Test in an Endemic Area in the State of Minas Gerais, Brazil

Evaluation of the Molluscicidal Properties of Euphorbia splendens var. hislopii (N.E.B.) Latex: Experimental Test in an Endemic Area in the State of Minas Gerais, Brazil

Spatial distribution of Schistosoma mansoni infection before and after chemotherapy with two praziquantel doses in a community of Pernambuco, Brazil

Effects of varying concentrations of the crude aqueous and ethanolic extracts of <i>Dalbergia sissoo</i> plant parts on <i>Biomphalaria pfeifferi</i> egg masses.

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