The Immune System, a Gift from the God
When viruses invade the body, macrophages rush to the site to collect information about the viruses.
Then, macrophages give the information about the viruses to the T cells which work as the commander in immunity. The T cells issue an order to kill cells contaminated by the viruses. What's more, the T cells issue another order to produce immune bodies to the B cells which then produce a large amount of antibodies. These antibodies in cooperation with complements start to destroy cells where viruses have invaded.
Macrophages appeared in the early stages of evolution of living things, so that they are in bodies of vertebrate animals, invertebrate animals, and almost all animals. The B cells and other white blood cells evolved from macrophages. In phagocytosis by macrophages, bacteria, viruses, and dead cells are eaten by macrophages, which is the main function of macrophages.
Macrophage (https://en.wikipedia.org/wiki/Macrophage)
Macrophages are a type of white blood cell of the immune system that engulfs and digests cellular debris, foreign substances, microbes, cancer cells, and anything else that does not have the type of proteins specific to healthy body cells on its surface in a process called phagocytosis.
To activate macrophages, the T cells should produce and deliver cytokines (a broad and loose category of small proteins important in cell signaling). A T cell is a type of lymphocyte, which develops in the thymus gland (hence the name) and plays a central role in the immune response. T cells can be distinguished from other lymphocytes by the presence of a T-cell receptor on the cell surface.
T Cell (https://en.wikipedia.org/wiki/T_cell)
So, to destroy viruses in the human body, this complicated immune system, which developed through long history of evolution of living things, in the human body should work properly.
However, the modern medical science cannot produce artificial macrophages, T cells, B cells, cytokines, etc. The nature has taken billions of years to create this immune system, so that we have to first learn details of structure, features, characteristics, and functions of each element of this immune system.
Only we can do is to reinforce activities of this immune system. Through various studies, we have found that common lifestyle with full of stress in modern material civilization gives adverse effect to the immune system. As we rely on medicines more than immune system beyond necessity, the immune system is reversely affected, undergoing regression. So, some medical doctors worry that modern medical services may cure a disease temporarily but must weaken the human body against viruses, cancer, etc. in the long run.
Indeed, Christ Jesus told not to mind foods since the body was more important than foods. And the God took care of men more than flowers in the field and birds in the sky. This saying means that we should rely on the immune system rather than modern medicines.
Indeed, the immune system in the human body is a gift from the God. We have to review and change our lifestyle so as to enhance the immune system.
**** **** *****
John 7
19 Did not Moses give you the law, and yet none of you keepeth the law? Why go ye about to kill me?
20 The people answered and said, Thou hast a devil: who goeth about to kill thee?
21 Jesus answered and said unto them, I have done one work, and ye all marvel.