Severe Combined Immune Deficiency (SCID) is characterized by a severely impaired immune response. Credit: Andrey_Popov/Shutterstock.com The activity of their specialized white blood cells (T and B lymphocytes, and, occasionally, natural killer cells) is so low that the body lacks its primary defense response, leaving it vulnerable to infection by viruses, bacteria and fungi. Without effective protection or treatment, SCID is […]

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