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A fever is usually caused by infections from viruses (such as a cold or the flu) or bacteria (such as strep throat or some ear infections). The fever itself is not the disease, only a sign that the body’s defenses are trying to fight an infection.

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How to Take a Child's Temperature

While you often can tell if your child is warmer than usual by feeling her forehead, only a thermometer can tell how high the temperature is. There are different ways to take your child's temperature depending on the age.