Estimation of the infectious reservoir of Plasmodium falciparum in natural vector populations based on oocyst size

Transactions of the Royal Society of Tropical Medicine and Hygiene
H HajiJ D Charlwood

Abstract

A method for determining the infectious reservoir of malaria (K) and vector survival rate (P) by measuring oocyst size and discriminating between the most recent and other infections is described. In the laboratory the mean diameter of 3 d oocysts in Anopheles gambiae, kept at 26 degrees C, was 11.5 microns and the mean diameter at day 5 was 24.5 microns. Oocyst sizes in wild caught mosquitoes from southern Tanzania, that had fed on the occupants of bed nets with holes in the sides, were more variable. 2060 A. gambiae s.l. and 1982 A. funestus were examined for oocysts 3 d after feeding; 796 and 654 oocysts from the 153 and 170 infected females, respectively, were measured. Because of misclassification errors, the use of a simple cut-off model, in which all oocysts less than 17.5 microns in diameter were considered to have arisen from the most recent feed, was thought to overestimate K and underestimate P. A statistical model which allows for overlap in the oocyst size distributions is described. Estimates of the infectious reservoir derived from this model were 2.8% for A. gambiae s.l. and 4.2% for A. funestus, and the estimated survival rates per gonotrophic cycle were 65.5% and 52.9%, respectively. The utility of measuring o...Continue Reading

References

Jul 1, 1992·Transactions of the Royal Society of Tropical Medicine and Hygiene·A K GithekoF H Collins
Sep 1, 1994·The American Journal of Tropical Medicine and Hygiene·P F BillingsleyR E Sinden
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Nov 1, 1957·The American Journal of Tropical Medicine and Hygiene·R C MUIRHEAD-THOMSON
May 1, 1952·Transactions of the Royal Society of Tropical Medicine and Hygiene·P G SHUTE, M MARYON

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Citations

Feb 13, 2001·Insect Biochemistry and Molecular Biology·M Shahabuddin, A Costero
Sep 6, 2007·PloS One·Alexander MoffettSahotra Sarkar
Mar 11, 2006·Evolution; International Journal of Organic Evolution·H HurdP Eggleston
Aug 26, 2006·The American Journal of Tropical Medicine and Hygiene·Amanda RossThomas Smith

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