Home The immune system. Immunity. Natural protection of the human body against external factors, bacteria, viruses, various diseases. A shield on the guard of a human being. The immune system. Immunity. Natural protection of the human body against external factors, bacteria, viruses, various diseases. A shield on the guard of a human being.

The immune system. Immunity. Natural protection of the human body against external factors, bacteria, viruses, various diseases. A shield on the guard of a human being.

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