Q: Can a fever restart 3 days after receiving treatment for Influenza B?

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:

I visited an ENT clinic on Friday around 5 PM due to a fever and was diagnosed with Influenza B. I received an IV flu treatment around 7 PM. I had no fever until early Tuesday morning (today), but around 4 AM, the fever spiked again to 38.5°C.

When I revisited the clinic on Monday morning, the doctor said the flu had passed and it seemed like a new cold had started. I was prescribed antibiotics because of yellow nasal discharge. But since the fever returned early this morning, I am very worried. Could the flu cause a fever to restart 3 days later? Do I need to go back and see the doctor again?

Answer:

I understand you are worried about the new fever during the flu treatment. Let me summarize the situation regarding the recurrence of fever after Tamiflu treatment.

Current Situation Analysis:

• 72 hours have passed since the Influenza B diagnosis

• Initial improvement after Tamiflu administration

• New symptoms (yellow nasal discharge) + recurring fever

Possible Causes:

1. Secondary bacterial infection - Most likely

→ A new infection occurring while the body is weakened by the flu

→ Yellow nasal discharge indicates this

2. Biphasic fever pattern of the flu itself

→ Rare, but possible

3. Initial reaction to starting antibiotics

What to do now:

• Administer fever reducers (after checking age/weight guidelines)

• Drink plenty of fluids

• Continue taking the antibiotics exactly as prescribed

⚠️ Cases where you need to revisit the hospital this morning:

• Persistent high fever of 39°C or higher

• Difficulty breathing or chest pain

• Severe headache or vomiting

• No improvement even after taking antibiotics for 48 hours

Since the doctor mentioned the possibility of a secondary infection during your Monday visit, the current antibiotic treatment seems appropriate. However, if the early morning fever continues or worsens, a follow-up consultation is necessary.

How is the child's overall condition? Are they eating and playing well?

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