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Open Release of Male Mosquitoes Infected with a Wolbachia Biopesticide: Field Performance and Infection Containment

Author

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  • Linda O'Connor
  • Catherine Plichart
  • Ayo Cheong Sang
  • Corey L Brelsfoard
  • Hervé C Bossin
  • Stephen L Dobson

Abstract

Background: Lymphatic filariasis (LF) is a globally significant disease, with 1.3 billion persons in 83 countries at risk. A coordinated effort of administering annual macrofilaricidal prophylactics to the entire at-risk population has succeeded in impacting and eliminating LF transmission in multiple regions. However, some areas in the South Pacific are predicted to persist as transmission sites, due in part to the biology of the mosquito vector, which has led to a call for additional tools to augment drug treatments. Autocidal strategies against mosquitoes are resurging in the effort against invasive mosquitoes and vector borne disease, with examples that include field trials of genetically modified mosquitoes and Wolbachia population replacement. However, critical questions must be addressed in anticipation of full field trials, including assessments of field competitiveness of transfected males and the risk of unintended population replacement. Methodology/Principal Findings: We report the outcome of field experiments testing a strategy that employs Wolbachia as a biopesticide. The strategy is based upon Wolbachia-induced conditional sterility, known as cytoplasmic incompatibility, and the repeated release of incompatible males to suppress a population. A criticism of the Wolbachia biopesticide approach is that unintended female release or horizontal Wolbachia transmission can result in population replacement instead of suppression. We present the outcome of laboratory and field experiments assessing the competitiveness of transfected males and their ability to transmit Wolbachia via horizontal transmission. Conclusions/Significance: The results demonstrate that Wolbachia-transfected Aedes polynesiensis males are competitive under field conditions during a thirty-week open release period, as indicated by mark, release, recapture and brood-hatch failure among females at the release site. Experiments demonstrate the males to be ‘dead end hosts’ for Wolbachia and that methods were adequate to prevent population replacement at the field site. The findings encourage the continued development and extension of a Wolbachia autocidal approach to additional medically important mosquito species. Author Summary: Additional tools are required to mitigate mosquito borne disease in the South Pacific, including human lymphatic filariasis (LF). Wolbachia are obligate intracellular bacteria that occur in a majority of insect species and that cause a form of conditional sterility in mosquitoes. Prior work demonstrates that male Aedes polynesiensis mosquitoes, which are artificially infected with Wolbachia (i.e., transinfected) can effectively sterilize wild type females in the laboratory, suggesting the potential applied use of Wolbachia as a pesticide for this medically important mosquito. As a critical intermediate step toward the development of the Wolbachia pesticide approach, we report on the field competitiveness of transinfected males and the risk of accidental horizontal transmission of Wolbachia from transinfected males. The outcome of laboratory cage trials and a thirty-week open release field trial provide evidence against horizontal transmission of Wolbachia from the transinfected males. Additionally, the field trial provides evidence for the competitiveness of transinfected males for indigenous female mates, as indicated by the failure of brood hatch and a resulting population level impact. No residual Wolbachia was detected in the targeted population during or after the male releases, showing released males to be ‘dead end hosts’ for Wolbachia. We discuss the results in relation to a disease control approach that integrates vector control with existing measures against LF.

Suggested Citation

  • Linda O'Connor & Catherine Plichart & Ayo Cheong Sang & Corey L Brelsfoard & Hervé C Bossin & Stephen L Dobson, 2012. "Open Release of Male Mosquitoes Infected with a Wolbachia Biopesticide: Field Performance and Infection Containment," PLOS Neglected Tropical Diseases, Public Library of Science, vol. 6(11), pages 1-7, November.
  • Handle: RePEc:plo:pntd00:0001797
    DOI: 10.1371/journal.pntd.0001797
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    References listed on IDEAS

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    1. Brian K Chu & Pamela J Hooper & Mark H Bradley & Deborah A McFarland & Eric A Ottesen, 2010. "The Economic Benefits Resulting from the First 8 Years of the Global Programme to Eliminate Lymphatic Filariasis (2000–2007)," PLOS Neglected Tropical Diseases, Public Library of Science, vol. 4(6), pages 1-18, June.
    2. A. A. Hoffmann & B. L. Montgomery & J. Popovici & I. Iturbe-Ormaetxe & P. H. Johnson & F. Muzzi & M. Greenfield & M. Durkan & Y. S. Leong & Y. Dong & H. Cook & J. Axford & A. G. Callahan & N. Kenny & , 2011. "Successful establishment of Wolbachia in Aedes populations to suppress dengue transmission," Nature, Nature, vol. 476(7361), pages 454-457, August.
    3. Eric W Chambers & Limb Hapairai & Bethany A Peel & Hervé Bossin & Stephen L Dobson, 2011. "Male Mating Competitiveness of a Wolbachia-Introgressed Aedes polynesiensis Strain under Semi-Field Conditions," PLOS Neglected Tropical Diseases, Public Library of Science, vol. 5(8), pages 1-6, August.
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