Immunity is the body's internal system, which provides protection from harmful influence of the environment. This system protects both the major external options and the function of vital organs and tissues it. Most living organisms are the mechanisms of nonspecific resistance, also known as congenital, constitutional or species immunity. Plants and many animals cope with infections with peptides capable of destroying pathogens. Ant microbial peptides of plants, protozoa, insects and higher animals, including humans are similar in structure. This suggests that they represent the ancient system of defense against infection, which persisted even in animals with a developed immune system almost intact. It is known that the higher beings immune system is necessary in order to combat infectious diseases, that is the simplest living organisms, pathogens: bacteria, microbes, fungi and of course viruses. But most likely, few people thought about the fact whether there is immunity in invertebrates such as insects. The search for the answer to this seemingly simple question led to the discovery of a new class of unique substances. It turns out that the immune system in the sense that we are used, the insects do not. They have not produced protective protein molecules - antibodies that can block the alien trapped in the body proteins. Meanwhile, scientists and doctors have long known that insect pathogens are able to still fight. Doctors distinguish between two types of immunity: specific and nonspecific. Specific immunity is individual and is formed throughout the life of man as a result of exposure to the immune system with a variety of microbes and antigens. Specific immunity retains the memory of past infection and prevents its recurrence. Nonspecific immunity is specific in nature that is almost identical for all members of the same species. Nonspecific immunity provides infection control in the early stages of its development, when specific immunity has not yet formed. The state of nonspecific immunity determines person's predisposition to various banal infection caused by pathogenic microbes are suspended. Immunity is divided into ant microbial (the body's defenses are directed against the pathogen itself) and antitoxic (defenses are directed against the toxins produced by the agent), sterile (existing and after the disappearance of the pathogen from the body) and non-sterile. Immunity develops and exists only in the presence of infective organism. There is a special system of building immunity.
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