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Vaccinations01:51

Vaccinations

Overview
Vaccines01:21

Vaccines

Vaccines are among the most effective tools in preventive medicine, designed to prepare the immune system to recognize and combat infectious agents. By introducing antigens—substances that the immune system identifies as foreign—vaccines stimulate an adaptive immune response that leads to immunological memory. This immunological memory enables the body to mount a faster and more effective response upon future exposures to the actual pathogen.Vaccines can be categorized based on the type of...
Active versus Passive Immunity01:31

Active versus Passive Immunity

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.
Active Immunity
Active immunity refers to the resistance one develops...
Immunological Memory01:23

Immunological Memory

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.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature is...
Microorganisms in Medicine and Therapeutics01:29

Microorganisms in Medicine and Therapeutics

Microorganisms play a fundamental role in vaccine development, gene therapy, and therapeutic production. Their biological properties are harnessed to advance medicine and public health. Beyond immunization, microorganisms contribute to gut health, antibiotic synthesis, and genetic disease treatment.Live Attenuated and Inactivated VaccinesLive attenuated vaccines, such as the measles, mumps, and rubella (MMR) vaccine, utilize weakened forms of pathogens to closely resemble natural infections.
Vaccine Production01:23

Vaccine Production

Vaccine production involves a sequence of upstream and downstream processes to generate a safe and effective immunological product. It begins with cultivating microorganisms, such as viruses or bacteria, to obtain antigenic material. For viral vaccines, mammalian host cells are grown in bioreactors and subsequently infected with the target virus. The virus replicates within the host cells, which are lysed to release viral particles. This lysate is then clarified through filtration or...

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Related Experiment Video

Updated: May 22, 2026

Evaluation of Host-Pathogen Responses and Vaccine Efficacy in Mice
08:52

Evaluation of Host-Pathogen Responses and Vaccine Efficacy in Mice

Published on: February 22, 2019

Vaccination and herd immunity: what more do we know?

Harunor Rashid1, Gulam Khandaker, Robert Booy

  • 1National Centre for Immunisation Research and Surveillance of Vaccine Preventable Diseases, The Children's Hospital at Westmead and The University of Sydney, Sydney, Australia.

Current Opinion in Infectious Diseases
|May 8, 2012
PubMed
Summary

Herd immunity, or herd protection, is complex, involving vaccine effectiveness and population factors. Understanding these dynamics is crucial for successful vaccination programs and disease prevention.

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Area of Science:

  • Immunology
  • Epidemiology
  • Public Health

Background:

  • Herd immunity is traditionally defined by the relationship between pathogen transmission dynamics and population immunity levels.
  • Recent conceptual advancements address complexities such as imperfect vaccine-induced immunity, population heterogeneity, and non-uniform vaccine uptake.

Purpose of the Study:

  • To review the concept of herd immunity, emphasizing its evolution and application in vaccination strategies.
  • To highlight recent developments in understanding herd protection in diverse populations.

Main Methods:

  • Literature review of conceptual developments in herd immunity.
  • Analysis of vaccine characteristics and population factors influencing herd protection.

Main Results:

  • Vaccine efficacy varies; conjugate vaccines (e.g., meningococcal, pneumococcal, Haemophilus influenzae type b) offer superior protection over polysaccharide vaccines.
  • High vaccination uptake is critical for diseases like measles to achieve effective disease prevention.
  • Waning immunity post-vaccination (e.g., pertussis) presents ongoing challenges for maintaining herd protection.

Conclusions:

  • Herd immunity is an intricate concept influenced by both vaccine properties and the characteristics of the vaccinated population.
  • Further research and application are necessary to fully grasp and leverage herd immunity principles.