ABC  Vol.1 No.3 , November 2011
Compatibility of Biomphalaria glabrata and B. alexandrina snails to infection with an egyptian strain of Schistosoma mansoni through two cycles in the experimental final host
ABSTRACT
The infection rate and cercarial production from B. glabrata, in comparison with B. alexandrina snails, post their exposure to S. mansoni miracidia of an E- gyptian strain after two cycles in albino-mice was stu-dies.The results indicated that infection rate of B. glabrata with the Egyptian strain of S. mansoni was less than that of B. alexandrina snails On the other hand infected B. glabrata exhibited a longer life span and a higher number of shedding cercariae, It was also, noticed that in the first cycle mice infected with S. mansoni cercariae shed from infected B. alexandrina snails, the mean number of worms recovered from infected mice was approximately twice that in mice infected with cercariae shed from infected B. glabrata snails The same observation was recorded from the mean number of ova/g liver tissue from infected mice. In the second cycle the same observation was recorded as first cycle suppression in the infection rate of B.glabrata than that B.alexandrina. Also, longer pre-patent period and life span Also, mice infection as the number of worms per infected mouse by cercariae shed from B.alexandrina snails was approximately 2.5 times that of mice infected by cercariae shed from B. glabrata being 29.3 and 12.5 worms/mouse.The results also indicated that the egg laying capacity of B. glabrata was higher than that B. alexandrina, It is concluded from this work that infectivity of S. man-soni cercariae shed from B. glabrata snails after two cycles of mice infection and used to infect the experi-mental final host was less than that of cercariae shed from infected B. alexandrina snails. This may declare a low compatibility of B. glabrata snails with the Egyptian strain of S. mansoni in comparison with B. alexandrina snails. However, this conclusion needs more passages of mice infection with cercariae to have precise data and conclusions.

Cite this paper
nullMahmoud, M. (2011) Compatibility of Biomphalaria glabrata and B. alexandrina snails to infection with an egyptian strain of Schistosoma mansoni through two cycles in the experimental final host. Advances in Biological Chemistry, 1, 103-108. doi: 10.4236/abc.2011.13012.
References
[1]   Engels D., Chitsulo, L., Montresor, A. and Savioli, L. (2002) The global epidemiological situation of schisto-somiasis and new approaches to control and research. Acta Tropica, 82, 139-146. doi:10.1016/S0001-706X(02)00045-1

[2]   Blair, D., Davis, G.M. and Wu, B. (2001) Evolutionary relationships between trematodes and snails emphasizing schistosomes and paragonimids. Parasitology, 123, s229- s243. doi:10.1017/S003118200100837X

[3]   Yousif, F., Haroun, N., Ibrahim, A. and El-Bardicy, S. (1996) Biomphalaria glabrata: A new threat for schisto-somiasis transmission in Egypt. Journal of the Egyptian Society of Parasitology, 26, 191-205.

[4]   Webster, J.P. (2001) Compatibility and sex in a snail schistosome system. Parasitology, 122, 423-432. doi:10.1017/S0031182001007442

[5]   Lively, C.M. and Dybdahl, M.F. (2000) Parasite adapta-tion to locally common host genotypes. Nature, 405, 679-681. doi:10.1038/35015069

[6]   Morgan, J.A.T., DeJong, R.J., Snyder, S.D., Mkooji, G.M. and Loker, E.S. (2001): Schistosoma mansoni and biomphalaria: Post history and future. Trends Parasitology, 123, s211-s228.

[7]   Bakry, F.A. (2009) Genetic variation between Biompha-laria alexandrina and Biomphalaria glabrata snails and their infection with Egyptain strain of Schistosoma man-soni. Journal of Applied Sciences Research, 5, 1142- 1148.

[8]   Webster, J.P. and Woolhouse, M.E.J. (1998) Selection and strain specificity host and their parasitic schistosomes. Evolution, 5, 1627-1634. doi:10.2307/2411336

[9]   Kalbe, M., Haberl, B., Hertel, J. and Haas, W. (1996) Heredity of specific host-finding behaviour in Schisto-soma mansoni miracidia. Parasitology, 128, 635-643. doi:10.1017/S0031182004005037

[10]   Hassan, A.H.M., Haberl, B., Hertel, J. and Haas, W. (2003) Miracidia of an Egyptian strain of Schistosoma mansoni differentiate between sympatric snail species. Journal of Parasitology, 89, 1248-1250. doi:10.1645/GE-85R

[11]   Liang, Y.S., Bruce, J.I. and Boy, D.A. (1987) Laboratory cultivation of schistosome vector snails and maintenance of schistosome life cycles. Center for Tropical Diseases University, Lowell, 34-48.

[12]   Cheever, A.W. (1968) Conditions affecting the accuracy of potassium hydroxide digestion techniques for counting Schistosoma mansoni eggs in tissues. Bull World Health Organization, 39, 328-331.

[13]   Petri, A. and Sabin, C. (2000) Medical statistics at a glance. Blackwell Science, London.

[14]   Kalbe, M., Haberl, B., Hertel, J. and Haas, W. (2004) Schistosoma mansoni miracidial-host finding: Species- specificity of an Egyptian strain. Parasitology Research, 82, 8-13. doi:10.1007/s004360050059

[15]   Files, V.S. (1951) A study of the vector-parasite relation-ships in Schistosoma mansoni. Parasitology, 41, 264-269. doi:10.1017/S0031182000084092

[16]   Knutz, R.E. (1952) Exposure of planorbid snails from the western hemisphere to miracidia of the Egyptian strain Schistosoma mansoni. Procedure of Helium Society Wa- shington, 19, 9-15.

[17]   Cridland, C.C. (1968) Results of exposure of batches from highly susceptible and less-susceptible strains of Biomphalaria alexandrina from Egypt to strains of Schi- stosoma mansoni from Cairo and Alexandria. Bull World Health Organization, 39, 955-961.

[18]   Yousif, F., Ibrahim, A., Kader, A.A. and El-Bardicy, S. (1998) Compatibility of Biomphalaria alexandrina, Bi-ompha- laria glabrata and a hybrid of both to seven strains of Schistosoma mansoni from Egypt. Journal of the Egyptian Society of Parasitology, 28, 863-881.

[19]   Frandsen, F. (1979) Studies of the relationships between schistosoma and their intermediate hosts. III. The genus Biomphalaria and Schistosoma mansoni from Egypt. Kongo, Sudan, Uganda, West Indies (St. Lucia) and Zaire (two different strains Kantanga and Kinshasa). Journal of Helminthology, 53, 321-348. doi:10.1017/S0022149X00006179

[20]   Jourdane, J., Mounkassa, J.B. and Imbert-Establet, D. (1990) Influence of intramolluscan larval stages of Echinostoma liei on the infectivity of Schistosoma man-soni cercariae. Journal of Helminthology, 64, 71-74. doi:10.1017/S0022149X00011925

[21]   Warren, K. S. and Peters, P.A. (1967) Quantitative aspects of exposure time and cercarial dispersion on penetration and maturation of Schistosoma mansoni in mice. American Journal of Tropical Medicine and Hygiene, 16, 718-722.

[22]   Blumenthal, U.J. and Jewsbury, J.M. (1983) Laboratory studies on a differential filtration technique for the re-covery of schistosome cercariae from natural waters. Annals of Tropical Medicine and Parasitology, 77, 441- 442.

[23]   Kloetzel, K. (1967) Egg and pigment production in S. mansoni infections of the white mouse. American Journal of Tropical Medicine and Hygiene, 16, 293-299.

[24]   Koura, M. (1970) The relation between egg production and worm burden in experimental schistosomiasis 1. Worm burden. Journal of the Egyptian Medical Associa-tion, 53, 598-602.

[25]   Grove, D.I. and Warren, K.S. (1976) Relation of Intensity of Infection to disease in Hamsters with Acute Schisto-somiasis Mansoni. American Journal of Tropical Medi-cine and Hygiene, 25, 608-612.

[26]   Sturrock, B.M. and Sturrock, R.F. (1970) Laboratory studies of the host-parasite relationship of Schistosoma mansoni and Biomphalaria glabrata from St. Lucia, West Indes. Annals of Tropical Medicine and Parasitology, 63, 357-363.

[27]   Pointier, J.P., Toffart, J.L. and Lefèvre, M. (1991) Life tables of freshwater snails of the genus Biomphalaria (B. glabrata, B. alexandrina, B. straminea) and of one of its competitors Melanoides tuberculata under laboratory conditions. Malacologia, 33, 43-54.

 
 
Top