Brady Collins
Vaccines introduce a killed or impaired version of a pathogen or a subunit of it into the body, giving our immune system a safe way to create an immune response. There are two types of immunity: active and passive. Active immunity is when exposure to a disease organism triggers the immune system to produce antibodies to that disease. Active immunity can be acquired through natural immunity or vaccine-induced immunity. Vaccine-induced active immunity results from exposure to killed or weakened bacteria or viruses through vaccination. This type of immunity takes longer to develop but lasts longer than passive immunity.
| Characteristics | Values |
|---|---|
| Type of immunity | Active immunity (also known as artificial active immunity) |
| How it works | Vaccines introduce a killed or impaired version of a pathogen or a subunit of it into the body, giving our immune system a safe way to create an immune response |
| Benefits | Vaccines offer our immune systems a chance to “train” for a future encounter and provide us with a “shortcut” to protection |
| Comparison with natural immunity | Vaccines offer protection without the risks associated with fighting off a natural infection |
| Comparison with passive immunity | Active immunity is long-lasting, and sometimes life-long, whereas passive immunity is short-lived |
| Time to develop protection | Active immunity takes time (usually several weeks) to develop, whereas passive immunity provides immediate protection |
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What You'll Learn
Active immunity
Vaccines contribute to active immunity by providing a controlled way to create an immune response. When a vaccine is introduced, the immune system treats it like any other exposure and works to stop the "assault". In the process, immunologic memory develops, allowing the immune system to train for future encounters with the disease. This memory consists of B and T cells that can recognize a particular pathogen and quickly multiply and activate other elements of the immune system if the pathogen is encountered again.
Examples of active immunity include immunity to strep throat after exposure to streptococcus bacteria and vaccine-induced immunity to diseases such as polio, chickenpox, and hepatitis B.
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Passive immunity
The major advantage of passive immunity is that it provides immediate protection, whereas active immunity takes time (usually several weeks) to develop. However, passive immunity is short-lived because the antibodies are not continually replenished as they would be in an individual whose immune system is responding directly. Passive immunization can be especially helpful for someone with a deficient immune system who does not respond to immunization.
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Artificially acquired active immunity
There are two types of immunity: active and passive. Active immunity occurs when exposure to a disease organism triggers the immune system to produce antibodies to that disease. Passive immunity occurs when a person is given antibodies to a disease rather than producing them through their own immune system.
The protection offered by artificially acquired active immunity is long-lasting and sometimes lifelong. This type of immunity provides immediate and rapid protection if the body is exposed to the disease in the future. The memory cells generated during the initial immune response recognize the disease and trigger a rapid production of antibodies to fight it off. This rapid immune response often prevents the development of symptoms of the disease.
Overall, artificially acquired active immunity is a safe and effective way to protect against infectious diseases by inducing the body's own immune system to produce antibodies and memory cells. This type of immunity offers long-lasting protection and is a crucial tool in public health to prevent and control the spread of infectious diseases.
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Vaccine-induced immunity
There are two types of immunity: active and passive. Active immunity can be further divided into two subtypes: natural immunity and vaccine-induced immunity.
Vaccines are designed to trigger an immune response without causing illness. They offer our immune systems a chance to "train" for a future encounter and provide us with a "shortcut" to protection. We gain the immunity that follows a natural infection without the risks associated with fighting off a natural infection.
Passive immunity, on the other hand, is when a person is given someone else's antibodies, either from another human or an animal. This type of immunity is short-lived, usually only lasting a few weeks or months, but it provides immediate protection. Passive immunity can be natural, such as when an infant receives antibodies from its mother, or artificial, such as when antibodies are given as a medication.
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Immunologic memory
Vaccines are designed to offer our immune systems a chance to "train" for a future encounter with a disease without causing illness. In doing so, vaccines provide us with a ""shortcut" to protection, allowing us to gain immunity without experiencing the risks of natural infection. This process of gaining immunity through vaccination is known as vaccine-induced immunity, a type of active immunity.
Active immunity results from exposure to a disease-causing organism, either through natural infection or vaccination. When the immune system encounters a vaccine, it treats it like any other exposure, working to stop the "assault" and develop immunologic memory. Immunologic memory is a critical feature of the adaptive immune system, enabling the body to recognize and respond rapidly to reinfection.
The innate immune system also exhibits memory-like behaviour, known as trained innate immunity. This type of immunologic memory results in altered immune responses upon subsequent encounters with pathogens. Immunologic memory is not fully understood, and ongoing research aims to uncover the mechanisms that control memory responses in the immune system.
Optimally, vaccines induce multiple levels of immunologic memory. The first level involves a rapid antibody response to block the pathogen's access. If the pathogen bypasses this initial defence, the second level activates anticipating memory T and B cells to protect against disease development. The efficacy of vaccines is influenced by the interplay between different cell subsets and the age-dependence of immunologic memory generation.
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Frequently asked questions
Vaccines produce artificially acquired active immunity.
Active immunity occurs when exposure to a disease organism triggers the immune system to produce antibodies to that disease. Active immunity can be acquired through natural immunity or vaccine-induced immunity.
Vaccines introduce a killed or weakened form of the disease organism or pathogen into the body, giving our immune system a safe way to create an immune response.
Active immunity is long-lasting, and sometimes life-long.
