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Bulinus tropicus from Central Kenya acting as a host forSchistosoma bovis

Abstract

One hundred and twelve snails were collected from two habitats on the Mau Escarpment, Kenya and were provisionally identified asBulinus tropicus from the characteristics of their shell and soft parts, chromosome number (n=18), electrophoresis of egg protein on cellulose acetate strip and isoelectric focusing of AcP, GPI, HBDH, MDH and PGM digestive gland enzymes. Of the 55 specimens examined alive in London, 10 were infected with amphistome and schistosome larvae, 9 with amphistome larvae and the remainder were uninfected. The GPI and MDH separations of known infected smail showed two distinct areas of activity: host and parasite. Individual hamsters were exposed to schistosome cercariae emanating from each snail with a double infection (apart from one which died prematurely) and examination of the resulting adult worms showed that all were monomorphic for AcP with a band of enzyme activity at pH 6.45, characteristic ofSchistosoma bovis. Examination of eggs found in two infections proved to beS. bovis in shape and size. Exposure of laboratory-bred snails ofB. tropicus from the Mau Escarpment and other populations ofB. tropicus proved negative. Thus, it is suggested that the presence of the amphistome infection may have a suppressive effect on the immune system of the snail, thereby allowingS. bovis to develop.

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References

  1. Brown DS (1976) A tetraploid freshwater snail (Planorbidae:Bulinus) in the highlands of Kenya. J Nat Hist 10:257–267

  2. Brown DS (1980) Freshwater snails of Africa and their medical importance. Taylor and Francis Ltd, London

  3. Brown DS, Wright CA (1972) On a polyploid complex of freshwater snails (Planorbidae Bulinus) in Ethiopia. J Zool Lond 167:97–132

  4. Brown DS, Oberholzer G, Van Eeden J (1971) TheBulinus natalensis/tropicus complex (Basommatophora: Planorbidae) in South-Eastern Africa: II Some biological observations, taxonomy and general discussion. Malacologia 11:171–198

  5. Brown DS, Jelnes JE, Kinoti GK, Ouma J (1981) Distribution in Kenya of intermediate host forSchistosoma. Trop Geogr Med 33:95–103

  6. Christensen NØ, Mutani A, Frandsen F (1983) A review of the biology and transmission ecology of African bovine species of the genusSchistosoma. Z Parasitenkd 69:551–570

  7. Dinnik JA, Dinnik NN (1954) The life cycle ofParamphistomum microbothrium Fischoeder, 1901 (Trematoda, Paramphistomidae). Parasitology 44:285–299

  8. Dinnik JA, Dinnik NN (1965) The schistosomes of domestic ruminants in Eastern Africa. Bull Epizoot Dis Afr 13:341–359

  9. Eduardo SL (1983) The taxonomy of the family Paramphistomidae Fischoeder, 1901 with special reference to the morphology of species occurring in ruminants, III. Revision of the genusCalicophoron, Näsmark, 1937. Syst Parasitol 5:25–79

  10. Graber M (1974) Mollusques du sous-genreBulimus s.s. (Basommatophora: Planorbidae), hôtes intermédiaires de divers trématodes parasites des ruminants domestiques d'Ethiopie. CR Acad Sci [D] Paris 278:2037–2039

  11. Graber M, Daynes P (1974) Mollusques vecteurs de Trématodoses humaines et animales en Ethiopie. Rev Elev Med Vet Pays Trop 27:307–322

  12. Lie KJ, Heyneman D, Richards CS (1977) Studies on resistance in snails: Interference by non-irradiated echinostome larvae with natural resistance toSchistosoma mansoni inBiomphalaria glabrata. J Invertebr Pathol 29:118–125

  13. Mandahl-Barth G (1957) Intermediate hosts ofSchistosoma. AfricanBiomphalaria andBulinus. 2. Bull WHO 17:1–35

  14. Oberholzer G, Brown DS, Van Eeden JA (1970) Taxonomic characters of the radula in theBulinus natalensis/tropicus complex. Wet Bydraes Potchefstroomse Univ B 10:1–61

  15. Ouma JH, Waithaka FT (in press)Bulinus tropicus (Krauss, 1848) from Kenya found naturally infected withSchistosoma bovis. Ann Trop Med Parasitol

  16. Pitchford RJ (1965) Differences in the egg morphology and certain biological characteristics of some African and Middle Eastern schistosomes, genusSchistosoma, with terminal-spined eggs. Bull WHO 32:105–132

  17. Southgate VR, Knowles RJ (1975a) The intermediate hosts ofSchistosoma bovis from Western Kenya. Trans R Soc Trop Med Hyg 69:356–357

  18. Southgate VR, Knowles RJ (1975b) Observation onSchistosoma bovis Sonsino, 1876. J Nat Hist 9:273–314

  19. Southgate VR, Knowles RJ (1978) Studies onSchistosoma bovis from different geographical areas. In Petrovic, Z (ed) Proceedings of the European Multicolloquy of parasitology; 2nd edn. Trogir (Drustro Parazitola Jugoslavije): 135–142

  20. Southgate VR, Rollinson D, Ross GC, Knowles RJ (1980) Observations on an isolate ofSchistosoma bovis from Tanzania. Z Parasitenkd 63:241–249

  21. Southgate VR, Ross GC, Knowles RJ (1981) OnSchistosoma leiperi Le Roux, 1955: Scanning electron microscopy of adult worms, compatibility with species ofBulinus, development inMesocricetus auratus, and isoenzymes. Z Parasitenkd 66:63–81

  22. Teesdale C (1962) Ecological observations on the molluscs of significance in the transmission of Bilharziasis in Kenya. Bull WHO 27:759–782

  23. Wright CA, Rollinson D (1979) Analysis of enzymes in theBulinus africanus group (Mollusca: Planorbidae) by isoelectric focusing. J Nat Hist 13:263–273

  24. Wright CA, Rollinson D (1981) Analysis of enzymes in theBulinus tropicus/truncatus complex (Mollusca: Planorbidae). J Nat Hist 15:873–885

  25. Wright CA, Rollinson D, Goll PA (1979) Parasites inBulinus senegalensis (Mollusca: Planorbidae) and their detection. Parasitology 79:95–105

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Correspondence to V. R. Southgate.

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Medical Research Council

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Southgate, V.R., Brown, D.S., Rollinson, D. et al. Bulinus tropicus from Central Kenya acting as a host forSchistosoma bovis . Z. Parasitenkd. 71, 61–69 (1985). https://doi.org/10.1007/BF00932919

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Keywords

  • Acetate
  • Cellulose
  • Enzyme Activity
  • Immune System
  • Chromosome Number