Seasonal influence on the production of Schistosoma haematobium and S. mansoni cercariae in Rhodesia

C. J. Shiff, A. Evans, C. Yiannakis, M. Eardley

Research output: Contribution to journalArticle

Abstract

Batches of Bulinus (Physopsis) globosus and Biomphalaria pfeifferi were exposed to Schistosoma haematobium and S. mansoni respectively each month for a 12-month period. The snails were kept out of doors in Salisbury (highveld) and indoors at Chiredzi (lowveld S. haematobium only) and examined weekly to determine the duration of prepatency, and the number of cercariae produced per infected snail. There was a strong seasonal influence in the highveld experiments which showed sporocyst dormancy in winter and the almost simultaneous maturation of infection in nine batches during early summer. In the lowveld the release of cercariae by infected B. globosus continued throughout the year although numbers fell off in winter. The prepatent period was prolonged in winter, but there was no evidence of sporocyst dormancy.

Original languageEnglish (US)
Pages (from-to)119-123
Number of pages5
JournalInternational Journal for Parasitology
Volume5
Issue number1
DOIs
StatePublished - Feb 1975
Externally publishedYes

Keywords

  • Rhodesia
  • Schistosomiasis
  • cercarial production
  • epidemiology
  • seasonal influences

ASJC Scopus subject areas

  • Parasitology
  • Infectious Diseases

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