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Related Concept Videos

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...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
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...
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...
Cross-reactivity00:42

Cross-reactivity

Overview

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Related Experiment Video

Updated: Jun 30, 2026

Intralymphatic Immunotherapy and Vaccination in Mice
07:33

Intralymphatic Immunotherapy and Vaccination in Mice

Published on: February 2, 2014

Vaccine injection technique and reactogenicity--evidence for practice.

Helen Petousis-Harris1

  • 1Immunisation Advisory Centre, Department of General Practice & Primary Health Care, School of Population Health, University of Auckland, PB 92 019 Auckland, New Zealand. h.petousis-harris@auckland.ac.nz

Vaccine
|September 23, 2008
PubMed
Summary

Proper vaccine administration technique, including injection site, needle length, and angle, can reduce vaccine reactions in children. These findings can inform public health policy for safer vaccination practices.

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Area of Science:

  • Vaccinology
  • Pediatric Medicine
  • Public Health

Background:

  • Inconsistent recommendations and practices exist for optimal vaccine administration.
  • Understanding factors influencing vaccine reactogenicity is crucial for improving patient experience and adherence.

Purpose of the Study:

  • To review existing literature on intramuscular vaccine administration techniques.
  • To identify specific techniques associated with reduced reactogenicity in pediatric populations.

Main Methods:

  • Systematic review of studies on vaccine administration techniques.
  • Analysis of variables including injection site, tissue type, needle length, and angle.
  • Focus on data from primarily pediatric populations.

Main Results:

  • Buttock injection site shows less reactogenicity than thigh.
  • Intramuscular administration is associated with fewer reactions than subcutaneous.
  • Longer needles and a 90-degree injection angle correlate with reduced reactogenicity.

Conclusions:

  • Specific vaccine administration techniques can minimize local reactions.
  • Consideration of injection site, needle length, and angle may improve vaccine tolerability.
  • Further empirical studies are needed to confirm findings and inform public health policy.