Lexis Hood

Lexis Hood

Modified & Updated: 11 Oct 2023

Source: Youtube.com

Acquired immunity, also known as adaptive immunity, is a fascinating aspect of the immune system that plays a crucial role in defending our bodies against harmful pathogens. Unlike innate immunity, which provides a general defense mechanism, acquired immunity is specific and develops over time. It involves the recognition and targeting of particular antigens, leading to the production of specific antibodies or immune cells that can eliminate the pathogen.

In this article, we will explore 16 astonishing facts about acquired immunity that highlight its complexity and efficiency in protecting our bodies. From the remarkable ability of our immune system to remember previous infections to the extraordinary diversity of immune cells, these facts will deepen our understanding of how acquired immunity works.

Table of Contents

Acquired immunity develops after exposure to pathogens.

Acquired immunity is triggered when our body encounters foreign substances like bacteria, viruses, or toxins. Our immune system responds by producing specific immune cells and antibodies to eliminate them.

It involves two types of immune responses: humoral and cellular.

The humoral response involves the production of antibodies by B cells, while the cellular response involves the activation of T cells to directly attack infected cells.

Memory cells play a crucial role in acquired immunity.

Memory B cells and memory T cells are created during the immune response. They “remember” the pathogens, allowing our body to mount a faster and stronger response upon re-exposure.

Vaccines enhance acquired immunity.

Vaccines contain weakened or inactivated forms of pathogens that stimulate an immune response. This exposure helps develop immunity without causing the actual disease.

Acquired immunity can be specific to particular pathogens.

Our immune system has the ability to recognize and respond to different pathogens in a highly specific manner, tailoring the immune response to target each specific invader.

It can also provide cross-protection.

In some cases, the acquired immune response to a specific pathogen may also confer protection against related pathogens, offering a degree of cross-protection.

Antibodies are key players in acquired immunity.

Antibodies, also known as immunoglobulins, interact with pathogens, neutralizing them, promoting their destruction, or preventing them from entering cells.

Acquired immunity can be passive or active.

Active acquired immunity is when our immune system responds to a pathogen, while passive acquired immunity is when we receive pre-formed antibodies from another source, such as through breastfeeding.

Some immune deficiencies can affect acquired immunity.

Individuals with certain genetic or acquired immune deficiencies may have a weakened or compromised acquired immune response, making them more susceptible to infections.

Acquired immunity can be long-lasting.

Once we have acquired immunity to a particular pathogen, it can last for years or even a lifetime, giving us ongoing protection against future infections.

It can be enhanced by repeated exposure.

Re-exposure to a pathogen can strengthen our acquired immune response, resulting in a more rapid and effective immune reaction if encountered again.

Acquired immunity can be transferred through blood products.

Through blood transfusions or the administration of immune globulins, acquired immunity can be transferred from one individual to another, providing temporary protection.

Immunological memory is a hallmark of acquired immunity.

The ability of our immune system to “remember” previous encounters with pathogens is key to acquired immunity and helps ensure a more efficient response in the future.

It can be boosted through natural exposure.

Exposure to mild or asymptomatic infections can strengthen our acquired immune response, boosting our overall immunity to various pathogens.

Acquired immunity can play a role in autoimmunity.

In some cases, the immune system can mistakenly attack our body’s own cells or tissues, leading to autoimmune disorders linked to acquired immunity dysfunction.

Understanding acquired immunity helps develop effective treatments.

Studying the mechanisms and intricacies of acquired immunity enables scientists to develop vaccines, therapies, and treatments to combat infectious diseases and immune-related disorders.

Overall, acquired immunity is a remarkable defense mechanism that our body employs to protect against pathogens. Its ability to adapt, remember, and target specific invaders is truly astonishing. By understanding these 16 astonishing facts about acquired immunity, we gain a deeper appreciation for the complexity and importance of our immune system in safeguarding our health.


In conclusion, acquired immunity is a fascinating aspect of our immune system that plays a crucial role in protecting us against various diseases and infections. Through the process of exposure to antigens, our bodies develop a defense mechanism that allows us to mount a strong and specific immune response upon encountering the same antigens again in the future.The 16 astonishing facts about acquired immunity highlight the complexity and efficiency of our immune system. From the development of memory cells to the role of vaccinations in enhancing our defenses, these facts provide us with a deeper understanding of how our bodies combat pathogens.Understanding and harnessing acquired immunity is crucial in the fields of medicine and immunology. Researchers continue to explore new ways to enhance our immune responses and develop innovative vaccines and treatments for various diseases.By gaining insights into the remarkable intricacies of acquired immunity, we can further appreciate the remarkable abilities of our immune system to adapt and protect us from harm.


Q: What is acquired immunity?

A: Acquired immunity, also known as adaptive immunity, is a specific defense mechanism of our immune system. It develops over time as a result of exposure to antigens, such as viruses, bacteria, or other foreign substances.

Q: How does acquired immunity differ from innate immunity?

A: Innate immunity is present from birth and provides a generalized defense against pathogens, while acquired immunity is more targeted and specific to particular antigens.

Q: How is acquired immunity acquired?

A: Acquired immunity can be acquired naturally through exposure to pathogens or artificially through vaccination.

Q: How long does acquired immunity last?

A: Acquired immunity can last for years or even a lifetime, as specialized memory cells are formed during the initial immune response to an antigen. These memory cells allow for a faster and more efficient response upon subsequent encounters with the same antigen.

Q: Can acquired immunity be transferred from one person to another?

A: Yes, acquired immunity can be transferred through the transfer of antibodies from a previously infected or vaccinated individual to another individual. This is known as passive immunity.

Q: What is the role of vaccinations in acquired immunity?

A: Vaccinations stimulate the immune system to generate a specific immune response against a particular antigen. This leads to the development of acquired immunity, providing protection against future infections.

Q: Can acquired immunity be lost?

A: Acquired immunity can diminish over time if there is no exposure to the specific antigens that stimulated the immune response initially. However, some memory cells may persist, providing a level of long-term protection.

Q: Can acquired immunity be developed for all diseases?

A: Acquired immunity can be developed for many diseases, but not all. Some pathogens, like the HIV virus, have complex mechanisms that evade or suppress the immune system, making it challenging to develop long-lasting immunity.

Q: How does acquired immunity contribute to herd immunity?

A: Acquired immunity plays a crucial role in achieving herd immunity. When a significant proportion of the population is immune to a specific disease, either through vaccination or previous infection, the spread of the disease is limited, protecting those who are unvaccinated or vulnerable.

Q: Can acquired immunity be reactivated after a long period of time?

A: Yes, acquired immunity can be reactivated upon re-exposure to the antigen. The memory cells produced during the initial immune response can quickly mount a specific immune response, providing protection even after a long period of time.