BSIP, LAURENT / SCIENCE PHOTO LIBRARY BSIP, LAURENT / SCIENCE PHOTO LIBRARY
Baby with immune deficiency and a health worker. The woman wears gloves and a mask to avoid transmitting germs to the baby. In cases of severe immune deficiency, pathogens (disease-causing micro-organisms) that normally cause mild illness can be fatal. Immune deficiency can be caused by exposure to radiation, infectious disease (such the acquired immune deficiency syndrome, AIDS) or a genetic defect (primary immune deficiency). Photographed at the Necker children's hospital, Paris, France.
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