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Host immune pressure accelerates parasite virulence evolution. Parasites evolved under immunity in mice became more virulent, posing greater risks to unvaccinated hosts, highlighting vaccination

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Area of Science:

  • Evolutionary biology
  • Immunology
  • Pathogen dynamics

Background:

  • Host immunity is predicted to influence parasite virulence evolution.
  • Previous studies have not experimentally determined the evolutionary impact of immune selection on virulence.

Purpose of the Study:

  • To experimentally test if immune pressure drives the evolution of increased pathogen virulence.
  • To investigate the evolutionary trajectory of virulence in Plasmodium chabaudi under varying immune conditions.

Main Methods:

  • Evolved parasite lines of Plasmodium chabaudi in both immunized and non-immunized (naïve) mice via serial passage.
  • Assessed virulence of evolved parasite lines in both naïve and immunized mouse hosts.
  • Examined virulence following transmission through mosquito vectors.

Main Results:

  • Parasite lines evolved under immune pressure exhibited increased virulence in both naïve and immunized mice compared to those evolved in naïve mice.
  • Mosquito transmission generally reduced virulence across all lines.
  • Immune-selected lines remained more virulent to naïve hosts post-transmission, but not to immunized hosts.

Conclusions:

  • Immune selection significantly accelerates the evolution of pathogen virulence.
  • Immune-selected parasites pose a greater threat to naïve hosts.
  • Results underscore the need to consider evolutionary consequences of vaccination on pathogen virulence.