Q: My child has a recurring high fever for 5 days after recovering from Influenza B. Should we get additional tests?

This post is a dramatization of a question and answer session experienced by our actual medical reviewers. Please note that this content is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.

Question:

Last Saturday night, a high fever started. On Monday, there was a diagnosis of Influenza B. After receiving IV fluid treatment, the fever went down by Wednesday.

However, on Thursday afternoon, the fever rose again to 38°C. We went to the clinic on Friday, and the doctor said not to worry too much, suggesting it might just be a new cold. Since then, the fever has been spiking regularly every 12 hours (morning and evening).

Yesterday (Monday) night, it went up to 38.6°C, and today (Tuesday) afternoon, it hit 38.7°C.

Should we get additional tests done? The fever is manageable enough that we don't need to cross-dose fever reducers, but I am very worried since it is the 5th day of this recurring fever after the flu.

Answer:

You must be very worried about the recurring fever after the flu. Thank you for clearly explaining the situation regarding the fever returning after the Influenza B treatment.

Current situation assessment:

• 5th day of recurring fever after the flu (38.6-38.7°C)

• Regular fever pattern at 12-hour intervals

• Cross-dosing of fever reducers is currently unnecessary

There are two main possibilities for this:

1. Secondary bacterial infection after the flu (such as otitis media, pneumonia, etc.)

2. A new viral infection (due to lowered immunity after the flu)

【When an immediate hospital revisit is necessary】

→ Fast or labored breathing

→ Chest pain or worsening cough

→ Complaining of ear pain (suspected otitis media)

→ Fever of 38.5°C or higher lasting for more than 3 days

→ Overall deterioration in general condition

A recurring fever persisting for 5 days after the flu requires a reassessment due to the possibility of complications. Especially considering the regular fever pattern and its duration, it is highly recommended to check for secondary infections through additional tests such as a blood test or a chest X-ray.

I advise you not to wait until tomorrow and to get a medical re-evaluation today. Early detection of post-flu complications is crucial.

For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.

https://fevercoach.us