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Subcutaneous vaccine administration - an outmoded practice
1Faculty of Health and Medicine, University of Newcastle, Callaghan, NSW, Australia.
Human Vaccines & Immunotherapeutics
|September 29, 2020
Summary
Intramuscular (IM) vaccine injection significantly reduces local adverse events and may improve immune response compared to subcutaneous (SC) delivery. This supports a shift towards IM administration for most vaccines to enhance safety and efficacy.
Area of Science:
- Immunology
- Vaccinology
- Public Health
Background:
- Subcutaneous vaccine administration is an outdated practice associated with local adverse events following immunization (AEFIs).
- AEFIs are a significant factor in vaccine hesitancy and refusal, potentially increasing vaccine-preventable disease prevalence.
- Current practices complicate vaccine administration recommendations.
Purpose of the Study:
- To review evidence comparing local adverse events and immune responses between subcutaneous (SC) and intramuscular (IM) vaccine administration.
- To provide evidence-based recommendations for optimizing vaccine delivery methods.
Main Methods:
- Extensive narrative review of scientific literature.
- Analysis of high-grade and moderate-grade evidence regarding vaccine administration routes.
Main Results:
- Intramuscular (IM) administration of all vaccine types significantly reduces local adverse events compared to SC injection.
- Moderate evidence suggests IM injection generates a greater immune response than SC injection.
- BCG and Rotavirus vaccines are exceptions to the IM recommendation.
Conclusions:
- Strong recommendation for IM injection of all vaccines, except BCG and Rotavirus, to minimize local adverse events.
- Shifting to IM administration can simplify vaccination practices and reduce inadvertent misadministration.
- Improved public trust in vaccination may result from simplified and safer administration methods.
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