Digestive 
Blood
Cardiovascular
Dermatology
Genitourinary,
Hormones
Infections
Oncology and
Musculo-skeletal
Mental health and
Parasites
Respiratory
Senses
Various
Fever is an important part of the body's defences against infection. Most bacteria and viruses that cause infections in people thrive best at 98.6 °F (37 °C).
Many infants and children develop high fevers with minor viral illnesses. Although fever is a sign that a battle might be going within the body, the fever is fighting for the person, not against him.
Usually, no brain damage will occur as a result of fever, unless it is higher than 107.6 °F (42 °C). Untreated fevers caused by infection will seldom exceed 105 °F (40.5 °C), unless the child is overdressed or trapped in a hot place.
