Lymphadenopathy. Swollen glands (lymphadenopathy) behind a child's ear. Swollen glands are caused by inflammation of the lymph nodes, which form part of the body's immune system. The lymph nodes con- tain thousands of white blood cells that attack invading microorganisms. During an infection they become highly active and can swell into painful, tender lumps. Children are especially prone to swollen glands because their lymph nodes are more active than those of adults. This case was caused by a vaccination against measles and rubella five days previously.
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