Compatibility of Biomphalaria alexandrina snails to infection with Schistosoma mansoni after exposure to sublethal concentrations of Myrrh

Massoud, A.; Metwally, D.M.; Khalifa, K.E.; Habib, F.S.M.

Journal of the Egyptian Society of Parasitology 34(3): 995-1008


ISSN/ISBN: 1110-0583
PMID: 15587324
Accession: 004083883

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A study was conducted to evaluate the effect of sublethal concentrations (lethal concentration, LC10 and LC20) of myrrh (Commiphora molmol) on the susceptibility of Biomphalaria alexandrina to infection with Schistosoma mansoni miracidia. Cercarial shedding was monitored at three weeks after miracidial exposure. No shedding of cercariae was observed in snails treated with 0.2 ppm myrrh (LC20). In snails treated with 0.1 ppm myrrh (LC10), there were longer prepatent cercarial and shorter cercarial production periods than those of control group (P=0.01). The number of infected snails and cercarial shedding were decreased. It is concluded that sublethal values of myrrh decreases the compatibility of B. alexandrina to S. mansoni infection thus playing an important role in the control of schistosomiasis.