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Medical infrared thermography of fever
Fever, also known as pyrexia and febrile response, is defined as having a temperature above the normal range due to an increase in the body's temperature set-point. There is not a single agreed-upon upper limit for normal temperature with sources using values between 37.5 and 38.3 °C (99.5 and 100.9 °F). The increase in set-point triggers increased muscle contraction and causes a feeling of cold. This results in greater heat production and efforts to conserve heat. When the set-point temperature returns to normal a person feels hot, becomes flushed, and may begin to sweat. Rarely a fever may trigger a febrile seizure. This is more common in young children. Fevers do not typically go higher than 41 to 42 °C (105.8 to 107.6 °F).
The advantage of thermography is here to give a global mapping of the thermal situation of the fever.
Source: Wikipedia
The upper thermography has the advantage to present the same young girl with fever and his usual mood, without fever.
Same situation in lower format and with a link to an article about use of thermography in fever detection at borders for example.
Complete text (en): Imaging at fever pitch
Higher format of the upper thermal image: Royal Photographic Society
Français: Fièvre
Nederlands: Koorts