How many days does a child’s recurrent fever usually last?

       The most common cause of fever in children is infection. Due to differences in the type and severity of infection, as well as individual variations in children’s physiological responses, their ability to absorb medications also varies—making it impossible to specify an exact number of days for recurrent fever.

       For example, bacterial pneumonia may cause high fever; once diagnosed, antibiotic therapy should be initiated promptly. With early and effective treatment, fever typically resolves within 1–2 days. In contrast, viral pneumonia often has an acute onset, with high fever (≥39°C) frequently appearing on days 1–2; some children may even develop temperatures exceeding 40°C. The overall illness course generally lasts 1–2 weeks, during which recurrent fever may occur. Mycoplasma pneumoniae pneumonia may cause fever persisting for 2–3 weeks. This condition is self-limiting, and most affected children recover spontaneously without specific treatment; however, appropriate antimicrobial therapy can shorten the disease duration. Chlamydia pneumoniae pneumonia is more commonly seen in older children aged 5 years and above, typically presenting with low-grade fever that may persist for 1–2 months. Therefore, the duration of recurrent fever in children cannot be generalized. As a general rule, if a child experiences recurrent fever three or more times, parents should seek prompt medical evaluation and treatment at a hospital.