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Our bodies' immune system keeps a track record of every microbe that it has ever encountered and defeated in the memory cells (white blood cells - B- and T-lymphocytes).
Once a microbe enters the body again, it can be easily recognized and defeated before it multiplies and make you feel sick.
Overactivity of the immune system can cause:
Underactivity of the immune system (immunodefiency):
Having an underactive immune system simply means that it does not function correctly and this makes people who have them vulnerable to infections and in the most sever cases, could be life-threatening.
With some infections we may experience getting a fever or a rise in our body's temperature. This is actually an immune system response and by doing so can actually kill some microbes and trigger the body's repair process.
Immunoglobulins, also known as antibodies, are used to treat people who are unable to make enough antibodies of their own or those whose antibodies don't work properly.
This can be delivered through:
The immunization process works by copying the body's natural immune response. We are then injected with vaccines that contain the same germs that cause the diseases but they have been either killed or wekaned to the point that they don't make you severely sick; others contain only a part of the disease germ.
However, the immunizations we may need are decided by our health, age, lifestyle and occupation. So it's best to consult with your doctor first, before anything else.
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Was learning about communicable diseases in biology, and found the process of immunity really interesting in the context of the COVID 19 pandemic.