Preliminary trials on the biological snail control with Bacillus Pinottii in Egypt

Dias, Emmanuel; Dawood, M. M.

doi:10.1590/s0074-02761955000100002

Cited by 12 publications

(5 citation statements)

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“…It was described as being a saprophytic bacterium that developed a high degree of virulence after repeated serial passage in A. glabratus. Destruction of A. glabratus with this bacterium was reported in laboratory and field trials carried out in Venezuela (Texera & Scorza, 1954) and in Egypt (Dias & Dawood, 1955), but these require critical evaluation and confirmation with rigorous controls.…”

Section: A Microbial Agentsmentioning

confidence: 97%

Studies on the biological control of schistosome-bearing snails. Predators and parasites of fresh-water mollusca: a review of the literature

Michelson

1957

Parasitology

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Although the biological control of medically important snails has been suggested from time to time during the past quarter of a century (Nagano, 1927; Bequaert, 1928; Mozely, 1939, 1951; McMullen, 1952), the subject has, as yet, received but little serious consideration. Upon the initiation of our studies (Chernin, Michelson & Augustine, 1956a, b) the literature was searched for references to predators, parasites and diseases of molluscs which might furnish leads for experimental investigation.

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Section: A Microbial Agentsmentioning

confidence: 97%

Studies on the biological control of schistosome-bearing snails. Predators and parasites of fresh-water mollusca: a review of the literature

Michelson

1957

Parasitology

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“…One of these was Bacillus pinotti , Cruz and Dias 1953, isolated from the ovotestis of B. glabrata . These bacteria are proteolytic aerobic organisms that are harmless to several vertebrate species and, under certain conditions, lethal to B. glabrata and other molluscs [ 25 – 27 ]. Studies focusing on their use in the biological control of some intermediate hosts [ 27 ] have been conducted, however, the results of these were not considered definitive [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…These bacteria are proteolytic aerobic organisms that are harmless to several vertebrate species and, under certain conditions, lethal to B. glabrata and other molluscs [ 25 – 27 ]. Studies focusing on their use in the biological control of some intermediate hosts [ 27 ] have been conducted, however, the results of these were not considered definitive [ 28 ]. Various chemical compounds, although considered toxic to the environment, have been used in experimental field studies [ 29 ], including copper sulfate, sodium pentachlorophenate, tritylmorpholine, and niclosamide.…”

Section: Introductionmentioning

confidence: 99%

Critical analysis of molluscicide application in schistosomiasis control programs in Brazil

Coelho

Caldeira

2016

Infect Dis Poverty

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In Brazil, Biomphalaria glabrata, B. tenagophila, and B. straminea are naturally infected by the trematode Schistosoma mansoni, the causative agent of schistosomiasis. Despite decades of governmental efforts through official control programs, schistosomiasis remains an important public health problem in the country: thousands of people are infected with the trematode each year and millions live in endemic areas. The World Health Organization recommends using a combination of molluscicide (niclosamide) and mass chemotherapy to control the transmission of schistosomiasis, with this treatment successfully reducing the morbidity of the disease. In the past, niclosamide has been used in official schistosomiasis control programs in Brazil. However, as B. glabrata recolonizes even after molluscicide application, the use of molluscicides has gradually decreased in the country until they were discontinued in 2002, mainly due to the rising global pressure to preserve the environment and the difficulties of obtaining licenses from the Brazilian Ministry of Environment to use toxic substances in aquatic ecosystems. Therefore, the discovery of new molluscicides, which could be more selective to Biomphalaria species and less harmful to the aquatic ecosystem, is necessary. In addition, political efforts to sensitize funders to provide grants for this field of research are required. In this context, this article aims to make a critical analysis of molluscicide application in schistosomiasis control programs in Brazil.Electronic supplementary materialThe online version of this article (doi:10.1186/s40249-016-0153-6) contains supplementary material, which is available to authorized users.

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“…Most work on effect of bacteria on medically important snails were carried out on Bacillus pinottii. Thus, this bacteria was used in laboratory and field trial to control A. glabratus in Venzuella (Textra & Scorza, 1954) and in Egypt, (Dias & Dawood, 1955). The latter authors added that this bacteria is harmless to vertebrates.…”

Section: Discussionmentioning

confidence: 99%

Effect of Biomphalaria Alexandrina Snails Infected by Bacillus Thuringiensis Kurstaki on Three Successive Generations of Schistosoma Mansoni

El-Bardicy

Tadros

Hafez

2005

Arab Universities Journal of Agricultural Sciences

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The effect of infection of Biomphalaria alexandrina snails with Bacillus thuringiensis kurstaki on various stages of Schistosoma mansoni life cycle was studied for three successive generations. Thus, two groups of snails were exposed to a sublethal concentration of the bacteria (0.08 gm/L water) containing 32000 IU/mg, for one week and to schistosome miracidia. One group was exposed to the miracidia before bacterial infection, while the other group to the miracidia after the bacterial infection. Cercariae produced from each group of snails were used to infect albino mice. The infection of snails and mice with the parasite was repeated for three generations of the parasite. In the first case, data obtained show that the schistosome infection rate of snails was considerably reduced being 60%, 18%, and 66.6% versus 90 % , 92% and 90% in untreated control snails in the three generations of the parasite, respectively. Meanwhile, the mean prepatent period was extended being 29.1  4.3 days, 33  1 days and 38.5  2.5 days versus 27 days in the control group. The number of worms recovered from infected mice showed reduction of 52 %, 78.4% and 58.6%, respectively. In the second case, the infection rate of snails was 40%, 16% and 73.7% for the three successive parasite generations and the prepatent period was 32  1 days, 32  2.3 days and 35  2.8 days, respectively. The reduction percentage of the recovered worms was 34.8, 73.6 and 72.9 in the sccessive generations, respectively. The present results prove that infecting B.alexandrina snails with a sublethal concentration of B. thuringiensis kurstaki bacteria exhibits clear negative effect on the transmission of S. mansoni in three successive generations. So, it could be recommended to use B. thuringiensis kurstaki as a potential biocontrol agent against S. mansoni.

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Preliminary trials on the biological snail control with Bacillus Pinottii in Egypt

Cited by 12 publications

References 0 publications

Studies on the biological control of schistosome-bearing snails. Predators and parasites of fresh-water mollusca: a review of the literature

Studies on the biological control of schistosome-bearing snails. Predators and parasites of fresh-water mollusca: a review of the literature

Critical analysis of molluscicide application in schistosomiasis control programs in Brazil

Effect of Biomphalaria Alexandrina Snails Infected by Bacillus Thuringiensis Kurstaki on Three Successive Generations of Schistosoma Mansoni

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