Immune system is a system which protects our body from toxins, bacteria, viruses and dangerous pathogens. There are many factors which may cause immune weakness such as blood transfusion, inadequate sleep, ultraviolet radiations, exposure to chemicals, drug therapies, athletic over training, surgery and certain bacterial and viral infection. Some of the common symptoms of immune weakness are constant fatigue, lethargy, recurring infections, depression, frequent diarrhea, tiredness, stress, in...
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