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The role of immune-mediated apparent competition in genetically diverse malaria infections

  • Lars Råberg
  • J C de Roode
  • A S Bell
  • P Stamou
  • D Gray
  • A F Read
Publiceringsår: 2006
Språk: Engelska
Sidor: 41-53
Publikation/Tidskrift/Serie: American Naturalist
Volym: 168
Nummer: 1
Dokumenttyp: Artikel i tidskrift
Förlag: University of Chicago Press


Competitive interactions between coinfecting genotypes of the same pathogen can impose selection on virulence, but the direction of this selection depends on the mechanisms behind the interactions. Here, we investigate how host immune responses contribute to competition between clones in mixed infections of the rodent malaria parasite Plasmodium chabaudi. We studied single and mixed infections of a virulent and an avirulent clone and compared the extent of competition in immunodeficient and immunocompetent mice (nude mice and T cell-reconstituted nude mice, respectively). In immunocompetent mice, the avirulent clone suffered more from competition than did the virulent clone. The competitive suppression of the avirulent clone was alleviated in immunodeficient mice. Moreover, the relative density of the avirulent clone in mixed infections was higher in immunodeficient than in immunocompetent mice. We conclude that immune-mediated interactions contributed to competitive suppression of the avirulent clone, although other mechanisms, presumably competition for resources such as red blood cells, must also be important. Because only the avirulent clone suffered from immune-mediated competition, this mechanism should contribute to selection for increased virulence in mixed infections in this host-parasite system. As far as we are aware, this is the first direct experimental evidence of immune-mediated apparent competition in any host-parasite system.


  • Biological Sciences
  • within-host competition.
  • quantitative PCR
  • indirect effects
  • multiple infection


  • Molecular Ecology and Evolution Lab
  • ISSN: 0003-0147

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