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Plasmodium falciparum malaria disease manifestations in humans and transmission to Anopheles gambiae: a field study in Western Kenya

Published online by Cambridge University Press:  03 March 2004

L. C. GOUAGNA
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya
H. M. FERGUSON
Affiliation:
Institute of Cell, Animal and Population Biology, University of Edinburgh West Mains Road, Edinburgh, UK
B. A. OKECH
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya Department of Zoology, Kenyatta University, P.O. Box 43844, Nairobi, Kenya
G. F. KILLEEN
Affiliation:
Department of Public Health and Epidemiology, Swiss Tropical Institute, Socinstrasse 57, CH.4002, Basel, Switzerland
E. W. KABIRU
Affiliation:
Department of Zoology, Kenyatta University, P.O. Box 43844, Nairobi, Kenya
J. C. BEIER
Affiliation:
University of Miami School of Medicine, Department of Epidemiology and Public Health Highland Professional Building, 1801 N.W. 9th Ave., Suite 300 (D-93), Miami, USA
J. I. GITHURE
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya Kenya Medical Research Institute, Nairobi, Kenya
G. YAN
Affiliation:
Department of Biological Sciences, State University of New York, Buffalo, NY14260 USA

Abstract

Transmission of the malaria parasite Plasmodium is influenced by many different host, vector and parasite factors. Here we conducted a field study at Mbita, an area of endemic malaria in Western Kenya, to test whether parasite transmission to mosquitoes is influenced by the severity of malaria infection in its human host at the time when gametocytes, the transmission forms, are present in the peripheral blood. We examined the infectivity of 81 Plasmodium falciparum gametocyte carriers to mosquitoes. Of these, 21 were patients with fever and other malaria-related symptoms, and 60 were recruited among apparently healthy volunteers. Laboratory-reared Anopheles gambiae s.s. (local strain) were experimentally infected with blood from these gametocyte carriers by membrane-feeding. The severity of the clinical symptoms was greater in febrile patients. These symptomatic patients had higher asexual parasitaemia and lower gametocyte densities (P=0·05) than healthy volunteers. Ookinete development occurred in only 6 out of the 21 symptomatic patients, of which only 33·3% successfully yielded oocysts. The oocyst prevalence was only 0·6% in the 546 mosquitoes that were fed on blood from this symptomatic group, with mean oocyst intensity of 0·2 (range 0–2) oocysts per mosquito. In contrast, a higher proportion (76·7%) of healthy gametocyte carriers yielded ookinetes, generating an oocyst rate of 12% in the 1332 mosquitoes that fed on them (mean intensity of 6·3, range: 1–105 oocysts per mosquito). Statistical analysis indicated that the increased infectivity of asymptomatic gametocyte carriers was not simply due to their greater gametocyte abundance, but also to the higher level of infectivity of their gametocytes, possibly due to lower parasite mortality within mosquitoes fed on blood from healthy hosts. These results suggest that blood factors and/or conditions correlated with illness reduce P. falciparum gametocyte infectivity.

Type
Research Article
Copyright
2004 Cambridge University Press

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