Discussion of the Paper on Simulium Damnosum

  • D. J. Lewis


In the first decade of this century, Simulium damnosum was discovered; in the third, it was recognized as a vector of human onchocerciasis. In the fourth decade, this disease, and in many areas river blindness, was accepted as an inevitable hazard, receiving much less attention than the killing diseases, while a few enthusiasts gathered knowledge on the vector. The fifth decade was one of promise, with the advent of DDT and some spectacular successes against Simulium larvae. Between 1951 and 1960, new areas were put under control including the Abuja region of Nigeria by R.N. Crosskey (1958). The seventh decade was one of increasing knowledge and of appraisal of results. S. damnosum, once regarded as a rather uniform species, was seen to be a complex of cytological categories and morphological variants. Physiological differences between some of these variants were revealed by B.O.L. Duke’s discovery of their association with geographical forms of Onchocerca volvulus.


Parous Rate Seventh Decade Bioclimatic Zone Breeding Place Killing Disease 
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  1. Crosskey, R.W. (1958) First results in the control of Simulium damnosum Theobald (Diptera, Simuliidae) in Northern Nigeria, Bull. ent. Res., 49, 715–735.CrossRefGoogle Scholar
  2. Davies, J.B. (1965) An assessment of the insecticidal control of Simulium damnosum Theobald in Abuja Emirate, northern Nigeria, from 1955 to 1960, II. The effect on the incidence of Onchocerca larvae in the vector, Ann. trop. Med. Parasit., 59, 43–46.PubMedGoogle Scholar
  3. Disney, R.H.L. (1972) Observations on chicken-biting blackflies in Cameroon with a discussion of parous rates in Simulium damnosum, Ann. trop. Med. Parasit., 66, 149–158.PubMedGoogle Scholar
  4. Duke, B.O.L., Lewis, D.J. and Moore, P.J. (1966) Onchocerca-Simulium complexes. I. Transmission of forest and Sudan-savanna strains of Onchocerca volvulus, from Cameroun, by Simulium damnosum from various West African bioclimatic zones, Ann. trop. Med. Parasit., 60, 318–336.PubMedGoogle Scholar
  5. Jamnback, H.A., Duflo, T. and Marr, D. (1970) Aerial application of larvicides for control of Simulium damnosum in Ghana: a preliminary trial, Bull. Wld Hlth. Org., 42, 826–828.Google Scholar
  6. Le Berre, R. (Lecture in the Congress) See Chapter 6.Google Scholar
  7. Naomesi, G.K. (1971) Dry-season survival of Simulium damnosum Theobald 1903 (Diptera: Simuliidae) in northern Ghana, West Africa, Ann. trop. Med. Parasit., 65, 555–564.Google Scholar

Copyright information

© Plenum Press, New York 1974

Authors and Affiliations

  • D. J. Lewis
    • 1
  1. 1.Medical Research Council London, British Museum (Natural History)UK

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