SciELO - Scientific Electronic Library Online

 
vol.25 issue1The association of malaria, HIV seropositivity and intravenous administration in drug usersSurveillance of Chagas' disease vectors in the State of S. Paulo, Brazil author indexsubject indexarticles search
Home Page  

Revista de Saúde Pública

Print version ISSN 0034-8910

Abstract

MAGALHAES, Luiz A.; ZANOTTI-MAGALHAES, Eliana M.; CARVALHO, José F. de  and  FARAONE, Marina. The miraxonal attraction exercised by Biomphalaria straminea, Lymnaea columella and Physa sp over miracidia of Schistosoma mansoni. Rev. Saúde Pública [online]. 1991, vol.25, n.1, pp. 23-27. ISSN 0034-8910.  http://dx.doi.org/10.1590/S0034-89101991000100005.

The attraction exercised over Schistosoma mansoni miracidia by Biomphalaria straminea, Lymnaea columella and Physa sp using a specially designed apparatus consisting of two circular glass chambers joined by an open channel were studied. The molluscs or their snail-conditioned water (SCW) was placed in one of the chambers (randomly chosen). In the channel ten miracidia was deposited and the count of miracidia in each of the three compartments (the two chambers and the channel) was recorded during fifteen minutes. Ten replications of each experiment with different specimens of molluscs and miracidia were made. Statistical and ad-hoc exploratory data analysis showed that: a) the three species of molluscs and their SCW attract the miracidia; b) Physa sp attract more miracidia then L. columella. There was an isolated single B. straminea specimen that had a repulsive effect to the miracidia.

Keywords : Biomphalaria [physiology]; Lymnaea [physiology]; Schistosoma mansoni [physiology]; Motor activity.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese