Top pic 102f, bottom pic 102.75f. Evaluate your fever. Fevers can be present in both viral and bacterial infections. However, fevers differ slightly with different types of infections. In bacterial infections, fevers tend to be higher. With a bacterial infection, fevers get worse after a few days while they tend to improve a few days in with a viral infection. The normal human body temperature runs between 97.8° F (36.5°C) and 99°F (37.2°C).