Immunity Active

Active immunity: How the body fights infections

Active immunity is the main way our body fights infectious diseases. It occurs as a result of the body's immune response to the introduction of an antigen - a substance that causes a response from the immune system.

When an antigen enters the body, it triggers a response from the immune system, which begins to produce antibodies - special proteins that can bind to the antigen and destroy it. Antibodies can also activate other cells of the immune system, such as T lymphocytes and macrophages, which are involved in clearing infection.

When the immune system produces antibodies and other cells to fight an infection, it remembers this antigen. This means that if the body encounters this antigen again in the future, the immune system will be ready to quickly and effectively fight the infection.

Active immunity can be natural or artificial. Natural immunity Active occurs when the body independently fights infection. Artificial immunity Active is achieved by introducing a vaccine into the body - a drug containing antigens that cause an immune response.

Vaccines are one of the most effective ways to prevent infectious diseases. They allow the body to develop immunity to certain infections without running the risk of developing disease. Vaccination has effectively eradicated diseases such as smallpox and polio.

However, not all people can receive vaccines due to medical contraindications, and there are also a number of people who do not want to be vaccinated. In such cases, Active immunity can be achieved naturally, but this may be associated with the risk of serious complications and even death.

In conclusion, Active immunity is an important mechanism of the body's defense against infectious diseases. Vaccines make it possible to achieve artificial Active immunity, which helps prevent the spread of infections and reduce morbidity. However, the decision to vaccinate should be thoughtful and based on consultation with medical specialists.

Active immunity is an I. that arises...

**Immunity** is a complex set of reactions of the body’s immune system to protect itself from internal and external foreign substances, including infectious agents, cancer cells and substances that react with the protective antigenic structure of its own cells (autoantigens), as well as from physical or chemical exposure , as a result of which the structures of the immune system itself are destroyed. Thus, the immune response protects the body from: