Skip to main content Accessibility help
×
Home

Morphometric variability of Schistosoma intercalatum eggs: a diagnostic dilemma

  • J. Almeda (a1), C. Ascaso (a1), G. A. Marçal (a2), M. Corachan (a3), V. R. Southgate (a4) and D. Rollinson (a4)...

Abstract

Variability of Schistosoma intercalatum eggs in shape and size, and their similarity to those of S. haematobium presented a problem of species identification when egg morphology was the diagnostic criterion used in a study of human schistosomiasis conducted on São Tomé and Principe. More than 2500 egg measurements were obtained by light micoscopy to gather data relating to size variability of S. intercalatum eggs, to evaluate whether factors such as age of host, sex of host and intensity of infection are correlated with variability, and the data were compared with previously published measurements on different isolates and strains of S. intercalatum: the range in length (104–203 μm) embraces most of the measurements reported in other studies of S. intercalatum eggs. There was no correlation either between age and sex of the host, or intensity of infection with variability of egg size. Comparison between measurements of the eggs of S. haematobium, S. intercalatum and S. bovis eggs are presented.

Copyright

Corresponding author

*Unidad de Epidemiologia y Bioestadistica, Fundacio Clinic per a la Recerca Biomedica, Villarroel 170, 08036 Barcelona, Spain.

References

Hide All
Almeda, J., Corachan, M., Sousa, A., Ascaso, C., Carvalho, J.M., Rollinson, D. & Southgate, V.R. (1994) Schistosomiasis in the Republic of São Tomé and Principe: human studies. Transactions of the Royal Society of Tropical Medicine and Hygiene 88, 406409.
Arene, F.O.I., Ukpeibo, E.T & Nwanze, E.A. (1989) Studies on schistosomiasis in the Niger Delta: Schistosoma intercalatum in the urban City of Port Harcourt, Nigeria. Public Health 103, 295301.
Bjorneboe, A. & Frandsen, F. (1979) A comparison of the characteristics of two strains of Schistosoma intercalatum Fisher, 1934 in mice. Journal of Helminthology 53, 195203.
Brown, D.S., Sarfati, C., Southgate, V.R., Ross, G.C. & Knowles, R.J. (1984) Observations on Schistosoma intercalatum in Southeast Gabon. Zeitschrift für Parasitenkunde 70, 243253.
Clapier, P.N. (1920) Contribution à l'ètude de la repartition des bilharzioses en Afrique Equatorials Francaise. Bulletin de la Société de Pathologi Exotique 13, 804809.
Corachan, M., Ruiz, L., Valls, M.E. & Gascon, J. (1992) Schistosomiasis and the Dogon country (Mali). American Journal of Tropical Medicine and Hygiene 47, 69.
Deniau, M., Eben-Moussi, E., Koki-Ndombo, P., Same-Ekobo, A. & Ripert, C. (1981) Sensitivity of a strain of Schistosoma intercalatum from Loum (Cameroon) and its natural hybrid to treatment with praziquantel. Preliminary results. Arzneimittelforschung 31, 589591.
De Clercq, D., Rollinson, D., Diarra, A., Sacko, M., Coulibaly, G., Landoure, G., Traore, M., Southgate, V.R., Kaukas, A. & Vercruysse, J. (1994) Schistosomiasis in Dogon country Mali: identification and prevalence of the species responsible for infection in the local community. Transactions of the Royal Society of Tropical Medicine and Hygiene 88, 653656.
Doumenge, J.P., Mott, K.E., Cheung, C., Villenave, D., Chapuis, O., Perrin, M.F. & Reaud-Thomas, G. (1987) Atlas of the global distribution of schistosomiasis. Presses Universitaires de Bordeaux, 1: 151.
Fain, A. (1952) Description de la cercaire de Schistosoma intercalatum Fisher, 1934 et d'une nouvefle xiphidiocercaire du groupe Ornatae (sous-groupe Prima). Annales de la Société Belge Médecine Tropicale 32, 433441.
Fisher, A.C. (1934) A study of the schistosomiasis of the Stanleyville District of the Belgian Congo. Transactions of the Royal Society of Tropical Medicine and Hygiene 28, 277306.
Frandsen, F. (1978) Hybridisation between strains of Schistosoma intercalatum Fisher, 1934 from Cameroun and Zaire, journal of Helminthology 52, 1122.
Gracio, M. A. (1988) The genus Bulinus in São Tomé e Principe: first record and contribution to the life history. Journal of Medical and Applied Malacology 1, 165172.
Kirkwood, B.R. (1988). Essentials of medical statistics. 148pp. Oxford, Blackwell Scientific Publications Ltd.
Lagrange, E. (1920) Sur un cas de bilharziose intestinale à Schistosoma haematobium. Bulletin de la Société de Pathologie Exotique 8, 2829.
Muller, R.L. & Taylor, M.G. (1972) On the specific use of the Ziehl Neelson technique for the specific identification of schistosome eggs. Journal of Helminthology 46, 139142.
Pages, J.R. & Théron, A. (1989) Schistosoma intercalatum: Variations morphologiques et biometriques des oeufs en relation avec la localization chez l'hote definitif et l'origine geographique du parasite (Cameroun et Zaire). Annales Parasitologie Humaine et Comparée 64, 208216.
Pampiglione, S., Visconti, S. & Pezzino, G. (1987) Human intestinal parasites in Subsaharan Africa. II. São Tomè and Principe. Parassitologia 29, 1525.
Pitchford, R.J. (1965) Differences in the egg morphology and certain biological characteristics of some African and Middle Eastern schistosomes, genus Schistosoma with terminal spined eggs. Bulletin of the World Health Organization 32, 105120.
Ratard, R.C. & Greer, G.J. (1991) A new focus of Schistosoma haematobium/S. intercalatum hybrid in Cameroon. American Journal of Tropical Medicine and Hygiene 45, 332338.
Rollinson, D. & Southgate, V.R. (1987) The genus Schistosoma: A taxonomic appraisal. pp. 1626in Rollinson, D. & Simpson, A.J.G. (Eds) The biology of schistosomes. From genes to latrines. London, Academic Press Limited.
Rollinson, D., Vercruysse, J., Southgate, V.R., Moore, P.J., Ross, G.C., Walker, T.K. & Knowles, R.J. (1987) Observations on human and animal schistosomiasis in Senegal, pp. 119132in Geerts, S., Kumar, V. & Brandt, J.(Eds) Helminth zoonoses. Martinus Nijhoff, Dordrecht.
Romero, M, Corachan, M. & Luis, M. (1989) Schistosomiasis in São Tomé. A pilot study. Transactions of the Royal Society of Tropical Medicine and Hygiene 83, 8182.
Sentís, J., Ascaso, C., Vallès, A. & Canela, J. (1992) Teoría del muestreo Cap.5. Estimatión de parámetros. pp. 111116in Licenciatura Biostadística.Cientificas y Técnicas, S.A. Barcelona.
Southgate, V.R., Rollinson, D., Ross, G.C. & Knowles, R.J. (1980) Observations on an isolate of Schistosoma bovis from Tanzania. Zeitschtift für Parasitenkunde 63, 241249.
Southgate, V.R., Rollinson, D., Kaukas, A., Almeda, J., Sousa, A.M., Castro, F., Soares, E. & Corachan, M. (1994) Schistosomiasis in the Republic of São Tomé and Principe: characterization of Schistosoma intercalatum. Transactions of the Royal Society of Tropical Medicine and Hygiene 88, 479486.
Taylor, M.G. (1970) Hybridization experiments on five species of African schistosomes. Journal of Helminthology 44, 253314.
Wijk, H.B. van (1969a) Infection with Schistosoma intercalatum in Mungo Department, Cameroun. Tropical and Geographical Medicine 21, 362374.
Wijk, H.B. van (1969b) Schistosoma intercalatum—infection in school-children of Loum, Cameroun. Tropical and Geographical Medicine 21, 375382.
World Health Organization (1993) The control of schistosomiasis. Second report of the WHO Expert Committee. World Health Organization Technical Report Series 830. Geneva: WHO 86 pp.
Wright, C.A., Southgate, V.R. & Knowles, R.J. (1972). What is Schistosoma intercalatum Fisher, 1934? Transactions of the Royal Society of Tropical Medicine and Hygiene 66, 2864.

Related content

Powered by UNSILO

Morphometric variability of Schistosoma intercalatum eggs: a diagnostic dilemma

  • J. Almeda (a1), C. Ascaso (a1), G. A. Marçal (a2), M. Corachan (a3), V. R. Southgate (a4) and D. Rollinson (a4)...

Metrics

Altmetric attention score

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.