OSCAR BURRIEL / SCIENCE PHOTO LIBRARY OSCAR BURRIEL / SCIENCE PHOTO LIBRARY
Measuring temperature. Mother holds a digital thermometer under her feverish young daughter's armpit to meaure body temperature. The child's temperature (38.8 Celsius) is read in digital form in the window of the thermometer. Fever (pyrexia) is defined as a body temperature above 37 Celsius (98.6 Fahrenheit). 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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