Medical diagnostic equipment, artwork. At upper right is a digital thermometer showing a high body temperature (fever). A normal temperature is around 37 degrees Celsius. Fever is usually caused by an infection, for instance due to a virus. Diagrammatic views of virus particles are seen at upper left, lower centre and far right. A stethoscope is also seen. This is used for listening to sounds inside the body. Some infections can affect the heartbeat or cause a change in lung sounds.
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