There are many ways to lower the temperature of 39 degrees physically, such as ice packs, warm water or alcohol wipes around the body, etc. There is no such thing as fast.
A body temperature of 39 degrees is considered high fever, and needs to be actively cooled down, commonly used methods include physical cooling, physical cooling methods are many, but there is no such thing as fast.
Physical cooling methods such as ice packs, ice bags or towels wrapped in ice on the forehead, sides of the neck, armpits, groin and other locations, so that it takes away a lot of heat in the body, so as to achieve the purpose of fever.
Warm water or alcohol rubbing around the body can stimulate skin vasodilatation to achieve the purpose of skin heat dissipation, and at the same time the evaporation of water as well as alcohol will also take away part of the heat.
If the body temperature reaches 39 degrees, in the physical cooling at the same time recommended timely consultation, clear diagnosis, to avoid delays in the condition.