INTRODUCTION: Your body’s defense against microorganisms that might spread illness is called the immune system. The most affected groups are infants and elderly people. The cause is that their immune systems, which have the capacity to destroy diseases, are weak or they lack sufficient physical strength. They were susceptible to infections, which led to subsequent difficulties that they had to deal with. Since bacteria, viruses, and other diseases cannot be seen with the human eye, we must protect ourselves. Facts of Immune system: The immune system is the main factor in a person’s resistance to infections. Since pathogens are a…