Immunity: Innate immunity and Acquired Immunity

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innate immunity


Every day we are revealed to a high number of infectious agents. However, only a few of these illnesses result in disease. Why? This is due to the fact that the body is capable to defend itself from most of these external agents. This overall ability of the host to fight the disease-causing factors, that given by the immune system is called immunity.

Immunity is of two types:

  1. Innate immunity, and
  2. Acquired immunity

(1). Innate Immunity Innate

Immunity is a non-specific type of deficiency, innate immunity is started at the time of birth. This innate immunity performed by providing different types of obstacles to the entry of harmful agents into our bodies. innate immunity consists of four types of barriers. These are,

  1. Physical barriers: This is the first type of innate immunity. The Skin on our body is the first barrier that prevents entry of the micro-organisms. Mucus coating of the epithelium lining of the respiratory, gastrointestinal and urogenital tracts also helps in protection from microbes in our body.
  2. Physiological barriers: In our body the Acid in the stomach, saliva in the mouth. Tears from eyes-all prevent microbial growth.
  3. Cellular barriers: Certain types of leukocytes like polymorpho-nuclear leukocytes (PMNL-neutrophils) and monocytes and natural killer (types of lymphocytes) in the blood as macrophages in tissues can phagocytose and destroy well as microbes in our body.
  4. Cytokine barriers: This is the last type of innate immunity. The Virus-infected cells secrete proteins called interferons which protect non-infected cells from viral infection.

(2). Acquired Immunity

Acquired immunity is a pathogen-specific type of deficiency. It is characterized by memory. This means that our body when it encounters a pathogen for the first time it produces a response called primary response which is of low enthusiasm.

After encounters with the same pathogen policies a highly intensified secondary or anamnestic response. This is ascribed to the fact that our body appears to have a memory of the first encounter.

The primary and secondary immune responses are carried out with the help of two special types of lymphocytes Antigen binding site Antige present i.e., B-lymphocytes and T- lymphocytes. The B-lymphocytes produce an army of proteins in response to pathogens into our blood to fight with them. These proteins are called antibodies.

antibody molecule
antibody molecule: innate immunity and acquired immunity

The T cells themselves do not secrete -0-0- antibodies, but help B cells to produce them. Each antibody molecule has four peptide chains, two small ones called light chains and two longer ones called heavy chains.

Therefore, a heavy chain antibody is represented as H, L. Different types of antibodies are generated in our bodies. IgA, IgM, IgE, IgG are some of them. A cartoon of an antibody is provided. Because these antibodies are found in the blood, the response is also called the humoral immune response.

This is one of two types of our antibody-mediated, acquired immune response. The second type is called a cell-mediated immune response or cell-mediated immunity (MIC). T lymphocytes mediate MIC. Very bleached, when some human organs like the heart, eyes, liver, and kidneys do not work in a biased way, the transplant is the only remedy that allows the patient to live a hormonal life.

Then a search begins to find a suitable donor. Why is it in the organs can not be taken from anyone? What do doctors review? Grafts from any source: an animal, another primate, or any human being cannot be done as grafts would be rejected sooner or later. Matching fabric. the pairing of blood groups is essential before any graft/transplant is performed and even after this the patient must take immunosuppressants throughout his life. The body is able to differentiate “itself” and “not itself” and the cell-mediated immune response is responsible for graft rejection.

Active Immunity and Passive Immunity

When a host is exposed to antigens, which can be in the form of living or dead microbes or other proteins, antibodies are produced in the host’s body. This type of immunity is called active immunity.

Active immunity is quite slow and it takes time to provide your full effective response. Deliberately injecting microbes during immunization or infectious organisms that grow access to the body during natural infection produces active immunity.

When the processed antibodies are administered immediately to protect the body against foreign agents, it is called passive immunity. Do you know why musher’s milk is considered very essential for the newborn? The yellowish liquid colostrum secreted by the mother during the first days of lactation has abundant antibodies (IgA) to protect the baby. The fetus also receives some antibodies from its mother, through the placenta during pregnancy. These are some examples of passive immunity.

Vaccination and Immunisation

The principle of immunization or vaccination depends on the “memory” property of the immune system. In vaccination, an inactivated / weakened pathogen or vaccine antigenic protein preparation (vaccine) is introduced into the body.

Antibodies produced in the body against these antigens would neutralize pathogens during actual infection. Vaccines also generate memory B and T cells that quickly recognize the pathogen on subsequent exposure and overwhelm invaders with massive antibody production.

If a person is affected with some deadly microbes that need a rapid immune response such as tetanus, we must include the preformed antibodies directly. or antitoxin (a preparation that contains antibodies against the toxin). Even in states of snake bites, the dose given to patients contains preformed antibodies against snake venom. This type of immunization is passive immunization of change.

Recombinant DNA technology has approved the creation of pathogen antigenic polypeptides in bacteria or yeast. Vaccines produced with this approach allow for large-scale production and therefore increased availability of immunization, for example, the hepatitis B vaccine produced from yeast.


Immunity is two types, they are innate immunity and acquired immunity.
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Strengthening the immune system has become of utmost importance in today’s times
Health experts have recommended four supplements that help the body fight viruses
The body’s immune system is your first line of defense against infections. Amid the global COVID-19 pandemic, which minerals and vitamins can help your body protect itself against the virus?

Four Vitamins and Minerals That Can Help

Holland & Barrett, a health brand, have listed four of the best minerals and vitamins that can help support your immune system. These are vitamins A, C, D, and Zinc.

vitamin and mineral ,prevent innate immunity and acquired immunity
vitamin and mineral, increase innate immunity and acquired immunity

Vitamin A

Vitamin A is believed to help in the development of a white blood cell type that produces antibodies. According to the Cancer Research Institute, antibodies are proteins binding themselves to particular markers called antigens and harmful invaders like viruses, germs or tumor cells.

The charity organization also revealed that these antibodies mark dangerous cells so other immune system cells will know which ones to attack and destroy. Vitamin A sources include dark green leafy vegetables like cabbage, spinach, watercress, carrots, and kale. Eggs and cod liver oil are also rich sources of vitamin A. This helps to increase innate immunity.

Vitamin C

The health brand also notes that vitamin C provides great help in supporting cellular functions that are required by your immune system. Rich sources of vitamin C include green and red peppers, tomatoes, strawberries, oranges, and broccoli.

Vitamin D

Health experts also recommend increasing your vitamin D levels to help maintain a strong and robust immune system. This will enable your body to fight off infections in a rapid manner. Since vitamin D is produced when sunlight touches your skin, those who are on self-isolation may find it a bit of struggle to produce enough, let alone increase its levels.

In light of this, it is recommended you take vitamin D supplements so that even if you are on self-isolation, your body will still have adequate levels of it.


A mineral that can help protect your body against viruses, according to health brand Holland & Barrett, is zinc. The health brand said that zinc plays an important role in the normal function of your immune system.

Chickpeas, seafood, sunflower seeds, red meat, pumpkin, and eggs, are all rich sources of the mineral zinc. Health experts, however, advise you should not go beyond the daily limit of 25mg.

10 FOODS TO BOOST YOUR IMMUNITY – HOW TO BOOST IMMUNITY NATURAL. Both innate immunity and acquired immunity

who to increase immunity , innate immunity and acquired immunity

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Immunity: Innate immunity and Acquired Immunity FAQ

What is immunity and type of immunity?

There are two types of immunity: active and passive: active immunity occurs when our own immune system is responsible for protecting us from a pathogen. Passive immunity occurs when we are protected from a pathogen by immunity obtained from another person.

How to increase immunity?

Vitamin C is one of the biggest immune system boosters. In fact, a lack of vitamin C can make you more prone to getting sick. So this vitamin plays an important role in immunity.

What is innate immunity?

Innate Immunity is a non-specific type of deficiency.

What is Acquired immunity?

Acquired immunity is pathogen-specific type of deficiency. It is characterized by memory.


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