Which of the following indicates a remittent fever?

A remittent fever is characterized by a sustained elevation in body temperature that does not return to baseline levels but rather shows fluctuations that remain above the normal range. This type of fever typically indicates underlying infections or other medical conditions that cause persistent febrile responses, such as certain bacterial infections (e.g., typhoid fever) or viral infections.

The description of option B aligns perfectly with the concept of remittent fever, as it highlights that the temperature elevation persists rather than normalizing, which is the key characteristic of this fever pattern. Maintaining an elevated temperature over time with variations indicates an ongoing inflammatory or infectious process.

In contrast, intermittent fever, which is described in option A, signifies periods of elevated temperature that drop back to normal at regular intervals, thus not fitting the criteria for remittent fever. Consistently normal temperature, presented in option C, shows that there is no fever present at all, which again is contrary to the concept of remittent fever. Finally, rapid oscillation between normal and high temperatures, described in option D, suggests a pattern more consistent with a different form of fever, such as intermittent fever, rather than remittent.