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Herd Immunity.

David R Smith1

  • 1Department of Pathobiology and Population Medicine, Mississippi State University College of Veterinary Medicine, PO Box 9100, 240 Wise Center Drive, Mississippi State, MS 39762, USA.

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|October 9, 2019
PubMed
Summary
This summary is machine-generated.

Herd immunity protects populations by reducing pathogen transmission when enough individuals are immune. Understanding this requires studying infection dynamics and immunity acquisition, as its loss can cause epidemics.

Keywords:
Basic reproductive numberContagious diseaseHerd immunityImmuneInfectiousnessSusceptible

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Area of Science:

  • Epidemiology
  • Immunology
  • Population Health

Background:

  • Herd immunity describes the population-level protection from pathogens achieved when a sufficient proportion of individuals possess immunity.
  • This concept is crucial for understanding disease transmission dynamics within a group or population.
  • Factors influencing herd immunity include infection dynamics, transmission modes, and individual immunity acquisition.

Purpose of the Study:

  • To explain the concept of herd immunity in the context of epidemic theory.
  • To highlight the importance of population-level immunity in preventing pathogen transmission.
  • To discuss factors influencing the establishment and loss of herd immunity.

Main Methods:

  • Review of epidemic theory principles.
  • Analysis of factors affecting pathogen transmission.
  • Examination of individual immunity acquisition and its population-level effects.

Main Results:

  • Herd immunity is achieved when immune individuals limit effective contact between diseased and susceptible individuals.
  • Understanding herd immunity necessitates considering infection dynamics and transmission modes.
  • Loss of herd immunity, potentially due to waning maternal immunity, can lead to age-associated disease epidemics.

Conclusions:

  • Herd immunity is a critical concept for controlling infectious diseases at a population level.
  • Factors such as pathogen transmission and individual immunity are key to maintaining herd immunity.
  • The decline of herd immunity can precipitate disease outbreaks, particularly in specific age groups.