Malaria transmission potential of Anopheles mosquitoes in the Mwea‐Tebere irrigation scheme, Kenya

J. N. IJUMBA, R. W. MWANGI, J. C. BEIER

Research output: Contribution to journalArticle

52 Scopus citations

Abstract

1. Anopheles arabiensis Patton and An. funestus Giles were identified as vectors of Plasmodium falciparum malaria in the Mwea-Tebere irrigation scheme, Kenya. An. arabiensis was the only member of the An. gambiae complex identified from chromosome characteristics. Other Anopheles species found included An. pharoensis Theobald, An. rufipes Gough and An. coustani Laveran. Survival rates per gonotrophic cycle for An. arabiensis averaged 0.37 during the short rains (October-November), 0.49 during the dry season (February) and 0.78 during the long rains (May-June). Vectorial capacities were correspondingly low due to low survival rates and a high degree of zoophily. The average duration of infective life for P. falciparum was 0.2 days for both An. arabiensis and An. funestus. In contrast, entomological inoculation rates were comparatively high: 6-8 infective bites/man/month. An. pharoensis averaged 110 bites/man/night during the short rains; 1/999 (0.1%) was positive by ELISA for P. falciparum circumsporozoite antigen, but the ELISA evidence is not conclusive for vector incrimination. In correspondence with clinical observations, the transmission of P. malariae and P. ovale is unlikely due to the low vector survival rates. The observed anomaly between low vectorial capacities and high entomological inoculation rates demonstrates the importance of accurately estimating vector sporozoite rates to monitor unstable malaria transmission in irrigated areas.

Original languageEnglish (US)
Pages (from-to)425-432
Number of pages8
JournalMedical and Veterinary Entomology
Volume4
Issue number4
DOIs
StatePublished - Oct 1990
Externally publishedYes

Keywords

  • Anopheles arabiensis
  • Anopheles funestus
  • Anopheles pharoensis
  • ELISA
  • Kenya
  • entomological inoculation rate
  • human blood index
  • survival rate
  • vectorial capacity
  • zoophily

ASJC Scopus subject areas

  • Parasitology
  • Ecology, Evolution, Behavior and Systematics
  • veterinary(all)
  • Insect Science

Fingerprint Dive into the research topics of 'Malaria transmission potential of Anopheles mosquitoes in the Mwea‐Tebere irrigation scheme, Kenya'. Together they form a unique fingerprint.

  • Cite this