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Immunity, along with the ability to limit pathogen growth to prevent significant body tissue damage, can be gained either by (1) actively developing an immune response within the individual after exposure to a pathogen or after getting vaccinated or (2) passively transferring immune components from an immune individual to one who is nonimmune. Both these forms of immunity can be found naturally and in medical practices.
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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Immunodeficiency Diseases01:25

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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Immune Response Against Viral Pathogens01:29

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
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Particle Agglutination Method for Poliovirus Identification
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Population Immunity and Polio Eradication.

Paul E M Fine1

  • 1Department of Infectious Disease Epidemiology and International Health, London School of Hygiene and Tropical Medicine, Keppel St., London WC1E 7HT, UK.

Pathogens (Basel, Switzerland)
|March 27, 2024
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The Global Polio Eradication Initiative faces challenges from vaccine-derived polioviruses and immune deficiencies. Understanding complex immunity is key to achieving polio eradication.

Keywords:
Polioeradicationherd immunityimmunityvaccination

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Area of Science:

  • * Immunology
  • * Virology
  • * Public Health

Background:

  • * The Global Polio Eradication Initiative, established in 1988, achieved significant progress through high vaccine coverage.
  • * Recent challenges include security issues, vaccine-derived poliovirus circulation, and prolonged infections in immunocompromised individuals.

Observation:

  • * Natural poliovirus infection and various vaccines induce distinct humoral and mucosal immune responses.
  • * Current immunological patterns in populations are complex due to these varied exposures.

Findings:

  • * Individuals with specific immune deficiencies can harbor and transmit poliovirus for extended periods.
  • * The interplay between different poliovirus strains (wild-type and vaccine-derived) and host immunity creates intricate immunological landscapes.

Implications:

  • * Managing population immunity requires a nuanced understanding of humoral and mucosal immunity to polioviruses.
  • * Strategies must address the persistence of infection in immunocompromised individuals and the impact of vaccine-derived polioviruses.
  • * Continued immunological surveillance is critical for the successful endgame of polio eradication.