How does the immune system fight an infection?

The immune system is the body’s in-built defence mechanism against illness. It works hard to guard you against invading viruses, bacteria, and parasites. When you are feeling fit as a fiddle, you tend not to think much about your immune system. But when you get a little cold or flu, folks wonder how our bodies keep diseases off.

But how exactly does the immune system work, and what happens once you get sick?

The exposure of real-world help us to learn new things. Similarly, exposure makes our immune system stronger. When your body comes in contact with a particular type of germ for the first time, immune reaction may take a while to understand and produce protein to fight. And probably it may take several days to form and use all the germ-fighting parts you would like to get rid of your infection. It takes time to hack the germ’s code and destroy it.

If your body encounters that very same germ afterwards, it will remember and fight it off faster. So you’ll recover from the infection and feel better quicker.

The “army” of our immune system is formed from differing types of white blood cells which is called defender cells. Body make a billion of those defender cells in our bone marrow a day.

Some of these white blood cells which are called Macrophages circulate our body trying to find germs and infection. When they see something that they don’t recognise, they attack immediately. Macrophages can tell the difference between your cells and invading cells, thanks to antigens. Antigens are like ID-tags on the surface of each cell. If a new cell doesn’t carry your unique antigen, then your system knows it’s foreign and see it as a threat.

What happens when the infection fights back?

At times, the virus or bacteria will fight back against the macrophages. When a subsequent set of white blood cells comes into action in the form of the more powerful T- and B- lymphocyte cells (part of the immune system which forms from bone marrow). B-cells make special proteins known as antibodies which bind to the virus and stop the virus from replicating. They also tag the virus with a special message so other white blood cells can destroy them.

Your T-cells help the B-cells out in different ways. A number of them will ring an alarm call in the body, rallying the army of other white blood cells. Some will destroy cells which have already been infected by the incoming virus. Some will help the B-cells to produce those important antibodies.

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