Plasmodium falciparum malaria challenge by the bite of aseptic Anopheles stephensi mosquitoes: results of a randomized infectivity trial.

Published online

Journal Article

BACKGROUND: Experimental infection of malaria-naïve volunteers by the bite of Plasmodium falciparum-infected mosquitoes is a preferred means to test the protective effect of malaria vaccines and drugs. The standard model relies on the bite of five infected mosquitoes to induce malaria. We examined the efficacy of malaria transmission using mosquitoes raised aseptically in compliance with current Good Manufacturing Practices (cGMPs). METHODS AND FINDINGS: Eighteen adults aged 18-40 years were randomized to receive 1, 3 or 5 bites of Anopheles stephensi mosquitoes infected with the chloroquine-sensitive NF54 strain of P. falciparum. Seventeen participants developed malaria; fourteen occurring on Day 11. The mean prepatent period was 10.9 days (9-12 days). The geometric mean parasitemia was 15.7 parasites/µL (range: 4-70) by microscopy. Polymerase chain reaction (PCR) detected parasites 3.1 (range: 0-4) days prior to microscopy. The geometric mean sporozoite load was 16,753 sporozoites per infected mosquito (range: 1,000-57,500). A 1-bite participant withdrew from the study on Day 13 post-challenge and was PCR and smear negative. CONCLUSIONS: The use of aseptic, cGMP-compliant P. falciparum-infected mosquitoes is safe, is associated with a precise prepatent period compared to the standard model and appears more efficient than the standard approach, as it led to infection in 100% (6/6) of volunteers exposed to three mosquito bites and 83% (5/6) of volunteers exposed to one mosquito bite. TRIAL REGISTRATION: NCT00744133.

Full Text

Duke Authors

Cited Authors

  • Lyke, KE; Laurens, M; Adams, M; Billingsley, PF; Richman, A; Loyevsky, M; Chakravarty, S; Plowe, CV; Sim, BKL; Edelman, R; Hoffman, SL

Published Date

  • October 21, 2010

Published In

Volume / Issue

  • 5 / 10

Start / End Page

  • e13490 -

PubMed ID

  • 21042404

Pubmed Central ID

  • 21042404

Electronic International Standard Serial Number (EISSN)

  • 1932-6203

Digital Object Identifier (DOI)

  • 10.1371/journal.pone.0013490


  • eng

Conference Location

  • United States