The process of introduction of weakened inactivated pathogen into human body is called

The process of introducing a weakened or inactivated pathogen into the human body is called vaccination. Here are the steps involved in this process:

1. Preparation of Vaccine: The pathogen (virus or bacteria) is either weakened or killed in the lab. Sometimes, instead of the whole pathogen, parts of the pathogen or its toxins are used to prepare the vaccine.

2. Administration of Vaccine: The prepared vaccine is then introduced into the body. This is usually done through an injection, but some vaccines can be given orally or nasally.

3. Immune Response: Once the vaccine is in the body, the immune system recognizes it as a foreign substance and produces an immune response. This involves the production of specific proteins called antibodies that can recognize and neutralize the pathogen.

4. Memory Cells: Some of the immune cells involved in this response become 'memory cells'. These cells remember the specific pathogen and can produce a faster and stronger immune response if the same pathogen enters the body again.

5. Protection: As a result of this process, the person is now protected against the disease caused by the pathogen. If they are exposed to the pathogen in the future, their immune system will be able to respond quickly and effectively, preventing the disease.