PAUL WHITEHILL / SCIENCE PHOTO LIBRARY PAUL WHITEHILL / SCIENCE PHOTO LIBRARY
Taking a temperature. His body temperature can be read using the scale running along the thermometer. A body temperature above 37 degrees Celsius would indicate that the boy has a fever (pyrexia), although temperatures vary with time and from person to person. Most fevers are caused by bacterial or viral infections. Symptoms include shivering, sweating, hot skin and thirst.
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