Lymphocytes are a type of white blood cell. Like other white blood cells, lymphocytes function as part of the body's immune system. Lymphocytes consist of three types, namely B cells, T cells and natural killer cells. Lymphocytes help fight and prevent bacterial and viral infections in the body, and help fight cancer. If the number of lymphocytes decreases, the body's ability to fight infection will be disrupted. In addition, the body can become more vulnerable to cancer. Conditions with low lymphocyte levels are called lymphocytopenia or lymphopenia. The condition for lymphopenia occurs in adults if the lymphocytes in the blood are below 1,500 per microliter of blood. Whereas in children will be considered to have lymphopenia if the level of lymphocytes is below 3,000 per microliter of blood. The number of lymphocytes that are less than the normal limit, it is feared will result in the body vulnerable to infection and also more at risk of cancer, and damage to various orga...