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Herd Immunity.

Authors
  • Smith, David R1
  • 1 Department of Pathobiology and Population Medicine, Mississippi State University College of Veterinary Medicine, PO Box 9100, 240 Wise Center Drive, Mississippi State, MS 39762, USA. Electronic address: [email protected]
Type
Published Article
Journal
The Veterinary clinics of North America. Food animal practice
Publication Date
Nov 01, 2019
Volume
35
Issue
3
Pages
593–604
Identifiers
DOI: 10.1016/j.cvfa.2019.07.001
PMID: 31590904
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Herd immunity is an important concept of epidemic theory regarding the population-level effect of individual immunity to prevent transmission of pathogens. Herd immunity exists when sufficient numbers of animals in a group or population have immunity against an agent such that the likelihood of an effective contact between diseased and susceptible individuals is reduced. Understanding herd immunity requires consideration of infection dynamics, modes of transmission, as well as the acquisition of immunity by individuals in the population. Loss of herd immunity may also explain age-associated epidemics of disease related to loss of passively acquired maternal immunity. Copyright © 2019 Elsevier Inc. All rights reserved.

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