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The implications of immunopathology for parasite evolution.

Alex Best¹, Gráinne Long, Andy White

¹School of Mathematics and Statistics, University of Sheffield, Sheffield S3 7RH, UK. a.best@shef.ac.uk

Proceedings. Biological Sciences

|May 4, 2012

Summary

Host immune responses can harm parasites, influencing disease severity. This study explores how immunopathology impacts parasite evolution, revealing that it can sometimes favor slower parasite growth and reduced disease severity.

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Area of Science:

Evolutionary biology
Parasitology
Immunology

Background:

Pathology in host-parasite interactions is often driven by the host immune response, not just direct parasite damage.
The evolutionary consequences of immunopathology on host-parasite dynamics are not well understood.

Purpose of the Study:

To theoretically investigate the evolutionary implications of immunopathology on parasite evolution.
To examine how immunopathology affects the evolution of disease severity by influencing transmission, virulence, and recovery.

Main Methods:

Theoretical modeling of host-parasite evolution.
Analysis of immunopathology's impact on epidemiological traits.

Main Results:

When immunopathology reduces parasite fitness (e.g., transmission), selection favors increased disease severity.
In some scenarios, parasites may benefit from immunopathology, leading to slower growth and potentially reduced disease severity.
Conclusions regarding disease severity evolution are sensitive to the specific measurement of severity.

Conclusions:

Immunopathology plays a complex role in the evolution of parasite virulence.
The evolutionary trajectory of disease severity depends on whether immunopathology is costly or beneficial to the parasite.
Understanding the measurement of disease severity is crucial for interpreting evolutionary outcomes.