When the body has an increased temperature, especially when this temperature progresses to the point of a fever, it is a clear sign it is trying to fight off an infection. In many instances, this could be something relatively simple such as the flu, but a high fever of up to 105 degrees Fahrenheit can also indicate pneumonia. It is quite common for both adults and children to have a fever when dealing with pneumonia. In most instances, fevers abate relatively quickly, but there can be times when they do not.
Patients who have had a persistent fever for more than two days, or when their temperature spikes above a certain level, should always visit a doctor. The temperature at which patients should immediately see a doctor does vary based on a few factors, but most older children and adults can tolerate a fever of up to 103 degrees Fahrenheit without too much cause for concern. Above this, and a doctor should be consulted.