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Viral evolution and transmission effectiveness.

Patsarin Rodpothong1, Prasert Auewarakul

  • 1Patsarin Rodpothong, Prasert Auewarakul, Department of Microbiology, Faculty of Medicine Siriraj Hospital, Bangkok 10700, Thailand.

World Journal of Virology
|November 1, 2013
PubMed
Summary

Viral transmission efficiency varies, impacting R0 (basic reproductive number). This review explores how R0 influences viral evolution and herd immunity thresholds, offering insights into virus strategies and potential escape mutants.

Keywords:
Antigenic diversityBasic reproductive numberHerd ImmunityInfluenzaMeaslesSelective pressureTransmissionViral infection

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Area of Science:

  • Virology
  • Epidemiology
  • Evolutionary Biology

Background:

  • Viruses exhibit varying transmission efficiencies, reflected in their basic reproductive number (R0).
  • A significant gap exists in understanding why antigenically diverse viruses (e.g., influenza) have low R0, while stable viruses (e.g., measles) have high R0.
  • R0 is crucial for determining herd immunity thresholds and outbreak dynamics.

Purpose of the Study:

  • To investigate the mechanistic explanations behind differing viral transmission efficiencies.
  • To explore hypotheses linking R0, intra-host dynamics, inter-host transmissibility, and viral evolution.
  • To understand the role of transmission strategy (naïve vs. partially immune populations) in viral adaptation.

Main Methods:

  • Review of existing literature on viral transmission, R0, and evolutionary strategies.
  • Analysis of theoretical models considering transmissibility optimization and diversity trade-offs.
  • Discussion of epidemiological factors influencing viral spread and host population immunity.

Main Results:

  • Optimization of transmissibility can lead to trade-offs between transmission efficiency and viral diversity.
  • Targeting specific host populations (naïve vs. immune) may influence viral evolutionary strategies.
  • Lower R0 values necessitate lower herd immunity thresholds, potentially leading to faster outbreak saturation.

Conclusions:

  • Understanding the factors influencing R0 is key to predicting viral evolution and outbreak control.
  • Herd immunity may exert selection pressure, potentially driving the emergence of escape mutants.
  • Further research into viral transmission strategies and their evolutionary consequences is warranted.