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Q: My 19-month-old's fever won't go down despite medication and is reaching 39.5°C. The older sibling has Flu B. What should I do?

Medically reviewed by Sang Hyun Ahn, MD

Content edited by Myeongchan Kim, MD


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:

My 19-month-old baby went to get a flu shot yesterday, and the pediatrician mentioned that their tonsils were swollen. Yesterday, the fever went down after taking a fever reducer, but from this morning until now, it only drops to 38.8°C before quickly shooting back up to 39–39.5°C despite medication. The baby is still eating and playing well, and there are no other symptoms besides the fever. However, our older child currently has influenza B. What should I do since the fever is so stubborn?


Answer:

It is concerning that your 19-month-old's fever is reaching 39.5°C and not responding well to fever reducers. Considering the swollen tonsils and the older sibling's influenza B infection, careful observation and prompt action are needed.


Current Assessment:

  • Persistent High Fever: The reduced effectiveness of the fever reducer combined with a continuous high fever suggests an infection may be progressing.

  • Exposure to Flu: Swollen tonsils coupled with direct exposure to the older sibling's flu increases the risk of a viral infection, specifically influenza B, which is highly contagious.

  • General Condition: It is a positive sign that your baby is eating and playing well, but high fevers in this context still require close medical monitoring.


Home Care Management:

  1. Fever Management: You may alternate between Acetaminophen and Ibuprofen every 4 hours if a single medication is not keeping the fever down.

  2. Hydration: Increase fluid intake by offering small sips of water every 10 minutes to prevent dehydration.

  3. Environment: Dress the child in light, breathable clothing and maintain a comfortable indoor room temperature of around 24–25°C (75–77°F).


Signs to Monitor:

Please keep a close eye on your child for any concerning symptoms, such as noisy breathing, difficulty swallowing saliva, or swelling around the neck and under the jaw. If your child shows any signs of struggling to breathe, please go to the nearest emergency room immediately.


Recommendation:

Because the fever is persisting at 39.5°C with a reduced response to medication, and there is a known exposure to influenza B, it is highly recommended that you revisit your pediatrician today. They can properly evaluate the swollen tonsils, test for the flu if necessary, and determine whether an antiviral medication is appropriate for your youngest child.


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







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