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Am. J. Trop. Med. Hyg., 4(5), 1955, pp. 781-789
Copyright © 1955 by The American Society of Tropical Medicine and Hygiene

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Infectivity to Mosquitoes of Plasmodium Falciparum as Related to Gametocyte Density and Duration of Infection1

Geoffrey M. Jeffery AND Don E. Eyles
National Institutes of Health, National Microbiological Institute, Laboratory of Tropical Diseases, Columbia, South Carolina

Mosquitoes were fed at all stages of infection on 88 cases of Plasmodium falciparum. Observations were made on the relations of gametocyte densities and length of patency to infectivity. Mosquitoes frequently became infected when fed on gametocyte densities of less than 10 per cmm. of blood, and were infected as late as day 321 of parasite patency in the South Carolina strain, and 410 in the Panama strain. It is concluded that the long enduring parasitemias of these South Carolina and Panama strains of P. falciparum are of considerable epidemiological importance and may be responsible for a large part of the transmission of this species in certain endemic areas.


1 These studies were carried out at the Milledgeville, Georgia, State Hospital. We express appreciation to the staff of the hospital for their cooperation and for furnishing laboratory facilities.




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P. SCHNEIDER, J. T. BOUSEMA, L. C. GOUAGNA, S. OTIENO, M. VAN DE VEGTE-BOLMER, S. A. OMAR, and R. W. SAUERWEIN
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A. ROSS, G. KILLEEN, and T. SMITH
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Copyright © 1955 by the American Society of Tropical Medicine and Hygiene.