CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY CRISTINA PEDRAZZINI / SCIENCE PHOTO LIBRARY
Measuring body temperature. Woman measuring her body temperature orally with a mercury thermometer. She may have a fever. A fever (pyrexia) is when the body temperature is hotter than normal (36.9 degrees Celsius in the mouth). Fevers are usually caused by bacterial or viral infections. The body raises its temperature in order to kill the infectious agents.
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