What does low fever after COVID-19 infection mean?

Fever caused by novel coronavirus infection is usually low-grade, which may result from viremia or secondary infection with other pathogens such as bacteria.

For patients with novel coronavirus infection experiencing low-grade fever, it is recommended to measure body temperature approximately every two hours and monitor whether the temperature shows a downward trend. If body temperature continues to rise above 38.5°C, antipyretic medications such as ibuprofen sustained-release capsules or acetaminophen tablets may be used according to medical advice.

Low-grade fever in patients with COVID-19 is often not severe. However, it is important to note that even critically or severely ill patients may present with only low-grade fever or even no fever at all. Individuals infected with the novel coronavirus may experience a persistent low fever around 37°C for 3–7 days, or they may develop high fever. Those with milder symptoms typically recover within seven days; however, if symptoms persist beyond seven days without improvement or are severe, prompt medical evaluation at a fever clinic is recommended.

If a patient with COVID-19 continues to have recurrent low-grade fever without relief, repeat tests including complete blood count and chest CT scan should be performed to assess for possible secondary bacterial infection. If secondary bacterial infection is identified upon evaluation, antibiotic therapy may be initiated. For managing low-grade fever, physical cooling methods should be prioritized, including increased fluid intake and tepid sponge baths. Additionally, indoor temperature and humidity should be properly adjusted, clothing layers managed appropriately, and adequate hydration maintained. Consuming plenty of fresh fruits and vegetables is also advised to promote recovery.