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An increase in body temperature above the normal oral temperature of 37°C (98.6°F) or rectal temperature of 37.2°C (99°F). This value is higher in children and lower in the elderly. It is usually caused by bacterial or viral infection and is generally associated with shivering, headache, nausea, constipation, or diarrhoea. Pyrexia may be intermittent with a rise and fall in body temperature returning to normal during the day.

Subjects: Dentistry.

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