MARK CLARKE / SCIENCE PHOTO LIBRARY MARK CLARKE / SCIENCE PHOTO LIBRARY
Feverish child. A flushed and sulking three year-old boy with a fever is comforted by his mother. Fever, also known as pyrexia, is defined as a body temperature above 37 Celsius (98.6 Fahrenheit) if measured in the mouth. Most fevers are caused by bacterial or viral infections and may be accompanied by other symptoms such as shivering, sweating, thirst and hot skin.
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