The army have to defense the country. In the similar to our body that we have the immune system that protect our body from pathogen. The immune system include of 2 part that is a lymphocyte and vessel. In this article the author have topic the interesting about immune system that is “How to boost your immune system” Immune system working ineffective when our body is weak and elderly. So we find the way to boost our immune system together. First we have avoid from them that is don’t smoke. Next is take steps to avoid inflection such as washing your hands frequently. Exercise regularly and maintain a healthy weight. The important one is get regular medical screening tests. So we have to take care outside the body, but don’t forget to take care inside the body because every part of the body have important to your’s life.