RICHARD T. NOWITZ / SCIENCE PHOTO LIBRARY RICHARD T. NOWITZ / SCIENCE PHOTO LIBRARY
School nurse with boy. A school nurse takes the oral temperature of a young boy with a thermometer during a check-up. Taking temperature is one way of checking for infection by viruses or bacteria. Infection often provokes a fever, where the body attempts to drive out harmful micro-organisms by heat. A fever is defined as a rise in oral temperature above the average healthy range of 36.5-37.2 Celsius. Minor infections are more common in children because their immune system is less well developed than that of adults.
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