The main key to a healthy immune system is an ability to distinguish between self and foreign objects into the body. Usually when there is a foreign object into the body recognized there will be a process of self-defense.
Any foreign object that triggers an immune response are called antigens. Antigen can like a microbial such as bacteria, virus, plasmodium, and mushrooms; even other individual tissues that enter the body such as organ transplants may be treated as a foreign body and can lead to rejection reactions. This is because the number of organ transplants that are unacceptable to the body and destroyed by our immune system.
In general, the mechanism of our body’s immune system is as follows;
when there is an antigen (foreign objects into the body) is detected, several types of cells work together to find out who they are and respond. These cells trigger the B lymphocytes to produce antibodies, a specific protein that leads to a specific antigen.
For example if someone has had chickenpox, then the individual typically is not the same disease again or if the contract will not give a fatal complications and rapid recovery. This is also a mechanism of how immunizations to prevent certain diseases. An immunization introduces the body to the antigen in a way that does not make sick, but enough to make the body produce antibodies that will protect a person from the disease in the future.
Antibodies could neutralize the toxin produced from a variety of organisms, and also antibodies can activate a group of proteins called complement that are part of the immune system and help destroy bacteria, viruses, or infected cells.
In other cases, the immune system which responds to excess or hipereaktif of a foreign object so that incoming antigens are called allergens and can cause symptoms such as swelling, watery eyes, runny nose, allergies, can even cause allergic reactions that threaten the great soul that is called anaphylaxis. Various kinds of allergic reactions incurred include asthma, eczema, allergic runny nose, cough allergy, food allergy, drug allergy and allergic to toxins.
The number of antibodies can be measured indirectly with CD4 cell counts. If the amount is less then a person suspected of having immunocompromized disease where the body resistance is very low, it can happen to people affected by HIV / AIDS, and non-HIV (old corticosteroid users, individuals with cancer, chronic diseases such as kidney failure, heart failure, diabetes, etc.)
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