Active Immunity
Active Immunity - Related Videos
01:31
Active versus Passive Immunity
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2024
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...
03:35
Flow Cytometry-Based Analysis of Dendritic Cell Activation Using Immune Complexes
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2025
This video demonstrates a protocol for assessing the activation of dendritic cells using immunoglobulin G (IgG)-coated tumor cells. Dendritic cells internalize the IgG-coated tumor cells, process the tumor antigens, and present them on the surface through MHC-II molecules, along with the co-expression of the costimulatory molecule CD86. These dendritic cells then undergo MHC-II and CD86-targeted immunostaining and flow cytometry analysis to identify their activation state.
02:22
Real-Time Assessment of the Antifungal Activity of Primary Human Immune Cells
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2025
This video demonstrates live cell imaging for the analysis of antifungal activity in human neutrophils using fluorescent Aspergillus reporter conidia. Initially, both red and magenta fluorescence are detected within neutrophils, while red fluorescence decreases over time, indicating the degradation of conidia and confirming the antifungal activity of neutrophils.
01:38
What is the Immune System?
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2019
Overview The immune system comprises diverse biological structures and processes that protect the body from disease. These processes can be classified into innate and adaptive immunity. To work effectively, the immune system needs to detect pathogens by distinguishing the body’s own structures from foreign elements. If this determination fails, autoimmune diseases occur in which the immune system reacts against the body’s own tissue. The Innate Immune System Acts Fast and Non-specifically
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Humoral Immune Responses
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2019
Overview The humoral immune response, also known as the antibody-mediated immune response, targets pathogens circulating in “humors,” or extracellular fluids, such as blood and lymph. Antibodies target invading pathogens for destruction via multiple defense mechanisms, including neutralization, opsonization, and activation of the complement system. Patients that are impaired in the production of antibodies suffer from severe and frequent infections by common pathogens and unusual pathogens. B...
FAQs
Exposure to a pathogen or its antigens activates immune cells that build a targeted defense. B lymphocytes respond by producing antibodies, while T lymphocytes coordinate immune activity and eliminate infected cells. This coordinated response transforms recognition of the antigen into cellular and antibody-based protection, helping the immune system address the specific biological threat it has encountered.
B lymphocytes contribute by producing antibodies directed against the encountered antigen. T lymphocytes provide complementary functions by coordinating immune activity and eliminating cells that have become infected. Because these lymphocyte populations address different parts of the response, active immunity depends on their combined activity rather than on antibody production alone.
Some activated immune cells become long-lived memory cells after the initial response. These cells preserve information about the encountered pathogen or antigen and support a more rapid response during later exposure. Their persistence explains why active immunity can provide lasting protection and why immune memory is central to understanding how prior exposure influences future defense.
Naturally acquired active immunity follows infection, so the immune system encounters the pathogen during disease. Vaccine-induced active immunity instead presents relevant antigens without causing the disease itself. Both pathways stimulate the body to generate its own antibodies, T-cell responses, and memory cells, but they differ in how the initial antigen exposure occurs.
Vaccination introduces antigens in a way that exposes the immune system to the features it must recognize without causing the disease itself. The resulting response activates B and T lymphocytes and can generate long-lived memory cells. This approach allows vaccine development to use the mechanisms of active immunity for disease prevention rather than relying on infection.
Active immunity connects cellular immune mechanisms with practical disease prevention. Researchers study antibody production, T-cell activity, and memory-cell formation to understand how protection develops and how vaccines can be designed. At the population level, this knowledge supports prevention strategies, while in biology it provides a framework for investigating immune memory and responses to pathogens.