Virulence, drug sensitivity and transmission success in the rodent malaria, Plasmodium chabaudi

Petra Schneider, Andrew S. Bell, Derek G. Sim, Aidan J. O'Donnell, Simon Blanford, Krijn P. Paaijmans, Andrew F. Read, Sarah E. Reece

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Here, we test the hypothesis that virulent malaria parasites are less susceptible to drug treatment than less virulent parasites. If true, drug treatment might promote the evolution of more virulent parasites (defined here as those doing more harm to hosts). Drug-resistance mechanisms that protect parasites through interactions with drug molecules at the sub-cellular level are well known. However, parasite phenotypes associated with virulence might also help parasites survive in the presence of drugs. For example, rapidly replicating parasites might be better able to recover in the host if drug treatment fails to eliminate parasites. We quantified the effects of drug treatment on the in-host survival and between-host transmission of rodent malaria (Plasmodium chabaudi) parasites which differed in virulence and had never been previously exposed to drugs. In all our treatment regimens and in single- and mixed-genotype infections, virulent parasites were less sensitive to pyrimethamine and artemisinin, the two antimalarial drugs we tested. Virulent parasites also achieved disproportionately greater transmission when exposed to pyrimethamine. Overall, our data suggest that drug treatment can select for more virulent parasites. Drugs targeting transmission stages (such as artemisinin) may minimize the evolutionary advantage of virulence in drug-treated infections.

Original languageEnglish (US)
Pages (from-to)4677-4685
Number of pages9
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1747
StatePublished - 2012
Externally publishedYes


  • Competition
  • Drug resistance
  • Fitness
  • Genetically diverse infection
  • Transmission
  • Virulence evolution

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology
  • General Immunology and Microbiology
  • General Environmental Science
  • General Agricultural and Biological Sciences


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