MARK CLARKE / SCIENCE PHOTO LIBRARY MARK CLARKE / SCIENCE PHOTO LIBRARY
Child with fever. A mother's hand holds the forehead of a six year-old boy in bed with fever in order to check the child's temperature. Fever occurs when the body's temperature rises above the normal (average) level of 37 degrees celsius. This rise is a natural response of the body's immune system to infection, and helps to destroy disease-causing micro-organisms in the body. Childhood fevers are common because children have a less well-developed immune system than adults. They are often triggered by minor infections, and are rarely serious.
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