The immune system is a defense system aimed at fighting invaders such as bacteria, viruses and fungi or altered own cells.
With a weakened immune system, our resistance is no longer able to adequately defend itself against outside invaders and/or changed own cells. This weakening can be the result of an illness, emotional and family problems, problems at work, stress, etc.
Modern diseases such as AIDS and CFS, FLU, HERPES are based on a weakening or severe limitation of the immune system