Effects of Bayluscide WP 70® on the Survival and Water-leaving Behaviour of Biomphalaria straminea, Snail Host of Schistosomiasis in Northeast Brazil

Physiological changes in Biomphalaria glabrata say, 1818 (Pulmonata: Planorbidae) caused by sub-lethal concentrations of the latex of Euphorbia splendens var. hislopii N.E.B (Euphorbiaceae)

“…The high escape percentage observed at concentrations of 0.2, 0.4 and 0.6 mg/l are in accord with data cited in the literature, such as the studies by Pieri and Jurberg (1981), Jurberg et al (1985) and Sarquis et al (1997Sarquis et al ( , 1998, where the various authors associate this movement to the toxic properties of natural and synthetic molluscides. This behavior shows an attempt by the snails to escape from an environment whose conditions threaten their survival.…”

“…hislopii latex on B. glabrata, the main intermediate host of S. mansoni in Brazil, at the concentrations recommended by the WHO (Mott 1987), this study is groundbreaking. The objective is to minimize the environmental effects on the limnic ecosystem.As there are small seasonal variations in the lethal latex concentration against Biomphalaria tenagophila recorded by Schall et al (1992), we conducted the present study with latex collected during one season, autumn, in order to avoid seasonal variations in the composition, and thus in the latex's effect on the snail.The high escape percentage observed at concentrations of 0.2, 0.4 and 0.6 mg/l are in accord with data cited in the literature, such as the studies by Pieri and Jurberg (1981), Jurberg et al (1985) and Sarquis et al (1997Sarquis et al ( , 1998, where the various authors associate this movement to the toxic properties of natural and synthetic molluscides. This behavior shows an attempt by the snails to escape from an environment whose conditions threaten their survival.…”

“…Application of this product caused biocidal action on non-target plants and animals (Andrews et al 1983), besides causing genotoxicity and carcinogenic effects (Vega et al 1988). The high cost (Pieri 1995), the possibility of recolonization of breeding grounds (Sarquis et al 1997(Sarquis et al , 1998, and the ecological toxicity of this product were limitations on its use as an official molluscide in government programs to control schistosomiasis.At the same time, various plants were tested as natural molluscides. Jurberg et al (1989) (Mendes et al 1984).…”

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.

“…Our results are reliably guaranteed by the susceptibilities of the viable 0-24 hour old egg masses to the prescribed dose of niclosamide (used as the positive control) which was within the limits reported in the literature for Biomphalaria species, including B. pfeifferi (Webbe, 1961;Shiff et al, 1970;Sarquis et al, 1997;Giovanelli et al, 2002).…”

Assessment of schistosomiasis, through school surveys, in the Forest Zone of Pernambuco, Brazil

“…The emphasis has been on the ecology and control of the mollusks that are the intermediate hosts (Barbosa 1992a,b, 1996, Barbosa & Barbosa 1994, 1996, Barbosa et al 1992, 1993, Bogéa et al 1996, Dannemann & Pieri 1989, 1991, 1993a, b, Favre et al 1995, 1997, Gazin et al 2000, Pieri 1995, Pieri & Dannemann 1996, Pieri & Thomas 1986, 1987, Randall et al 2001, Sarquis et al 1997, the ecological and epidemiological determinants of the disease (Barbosa 1992b, 1997, 1998a, b, Barbosa & Coimbra 2000, Barbosa & Gouveia 2000, Coutinho et al 1997, Gazin et al 2002, Gonçalves et al 1992, Simões-Barbosa et al 2001, and also the impact of chemotherapy treatment for infected individuals, in relation to the transmission dynamics of the disease , Favre et al 2002, Zani et al 2004). The knowledge resulting from these studies has made it possible to adapt the schistosomiasis evaluation and control strategies recommended by central health bodies -WHO at the worldwide level and the Health Surveillance Department of the Ministry of Health at the national level -to the regional characteristics and demands.…”