PATIENTS WITH IMMUNE DEFICIENCY ARE SUSCEPTIBLE TO A VARIETY OF INFECTIONS SUCH AS VIRAL INFECTIONS. IN SOME CASES IMMUNODEFICIENCY IS EITHER PRIMARY OR CONGENITAL. HOWEVER, IN MOST CASES, THIS CONDITION IS ESTABLISHED FOR VARIOUS REASONS SUCH AS MALNUTRITION OR MEDICAL TREATMENTS SUCH AS CHEMOTHERAPY, IMMUNOSUPPRESSIVE DRUGS, ORGAN TRANSPLANTS, CANCER OR HIV INFECTION. EARLY DIAGNOSIS OF VIRAL opportunistic INFECTIONS, IS VERY IMPORTANT IN THE PREVENTION, CONTROL AND TREATMENT OF PATIENTS.THEREFORE, PATIENT MANAGEMENT BY PHYSICIANS BEFORE AND AFTER IMMUNOSUPPRESSION ON THE ONE HAND AND RAPID AND ACCURATE DIAGNOSIS OF THE INFECTIOUS AGENT BY LABORATORIES ON THE OTHER HAND IS VERY IMPORTANT IN THIS REGARDS...