IAN BODDY / SCIENCE PHOTO LIBRARY IAN BODDY / SCIENCE PHOTO LIBRARY
Feverish children. Four-year-old girl (foreground) and her five-year-old brother sit in bed recovering from a fever. Fever, known as pyrexia, is defined as a body temperature above 37 Celsius (98.6 Fahrenheit), when the temperature is checked orally. Most fevers are caused by bacterial or viral infections and may be accompanied by other symptoms such as shivering, sweating, headaches, thirst and hot skin.
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