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Vaccinations

Vaccinations

Pharmacovigilance

Pharmacovigilance

Post-marketing surveillance is a critical component of pharmaceutical regulation, often uncovering unanticipated adverse drug reactions (ADRs) once a drug is widely used over an extended period.
This process, termed pharmacovigilance, aims to detect, evaluate, and minimize harmful effects related to medication use. The data collection for pharmacovigilance depends on spontaneous reporting systems, where healthcare professionals or patients voluntarily report suspected ADRs.
In some cases, there...

Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

Vaccines

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...

Allergic Reactions: Anaphylaxis

Allergic Reactions: Anaphylaxis

Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin, heparin),...

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Updated: Jul 19, 2026

Intracranial Injection of Adeno-associated Viral Vectors

Intracranial Injection of Adeno-associated Viral Vectors

Published on: November 17, 2010

[Adverse events after vaccination].

Hanne Nøkleby¹, Marianne A Riise Bergsaker

¹Divisjon for smittevern, Nasjonalt folkehelseinstitutt, Oslo, Norway. hano@fhi.no

Tidsskrift for Den Norske Laegeforening : Tidsskrift for Praktisk Medicin, Ny Raekke

|October 10, 2006

Summary

Vaccine safety monitoring has evolved, with rigorous controls minimizing production risks. Post-licensure surveillance is crucial for detecting rare adverse events and maintaining vaccine credibility.

Area of Science:

Immunology
Public Health
Epidemiology

Context:

Historically, vaccine-preventable diseases were common, overshadowing vaccine risks.
Past vaccine-related issues stemmed from production failures and inadequate controls.
Current vaccine production and control standards are exceptionally rigorous, nearing zero risk for such historical failures.

Purpose:

To discuss the evolution of vaccine safety monitoring and risk perception.
To highlight the importance of post-licensure surveillance for rare adverse events.
To emphasize the role of adverse event reporting systems in maintaining vaccine credibility.

Summary:

Vaccine risks are more scrutinized when diseases are rare.
While historical vaccine issues existed due to production and control failures, modern standards are extremely stringent.

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Intracranial Injection of Adeno-associated Viral Vectors

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Published on: November 17, 2010

Rapid In Vivo Assessment of Adjuvant's Cytotoxic T Lymphocytes Generation Capabilities for Vaccine Development

Rapid In Vivo Assessment of Adjuvant's Cytotoxic T Lymphocytes Generation Capabilities for Vaccine Development

Published on: June 19, 2018

Common reactions are well-documented; rare events emerge through post-marketing surveillance.

Adverse event notification systems and epidemiological studies are vital for distinguishing causality from coincidence.

Transparency regarding vaccine adverse events is essential for public trust.

Impact:

Ensures continued public confidence in vaccine safety and efficacy.
Facilitates timely identification and management of rare vaccine side effects.
Supports evidence-based decision-making in vaccination programs and public health policy.