immunodeficiency and autoimmune disease may occur concomitantly in the same individual. some of the immunodeficiency syndromes, especially humoral defects are associated with autoimmune disorders. hematological manifestations such as thrombocytopenia and hemolytic anemia are the most common presentations. persistent antigen stimulation due to an inherent defect in the ability of the immune syst...

arthralgia is a common presenting symptom of many rheumatic diseases. vitamin d deficiency may lead to progression of skeletal symptoms to definite disease in susceptible subjects. this study was conducted to determine the relationship between vitamin d deficiency and unexplained arthralgia. patients with arthralgia not related to a definite clinical condition were selected prospectively among ...