Q: Fever returned right after recovering from the flu. Can my child get infected again?
- Myeongchan Kim
- 4 days ago
- 3 min read
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 child started having a fever a few days ago. Initially, they tested negative for the flu, but the next day, they tested positive. They received an IV flu treatment and took cold and allergy medications. Today, we went to the doctor, who said we could stop the antibiotics. However, my child has a fever again right now.
Is it possible to catch the flu again immediately? If there's a fever, will they do another flu test? My child is currently staying at a relative's house, and a family member living there is on day 3 of the flu. They don't eat together, but could my child have caught it again from them? Also, my child had pneumonia a couple of months ago and has been on medication ever since. I am so worried and upset.
Answer:
It is completely understandable that you are upset and worried, especially since your child has been on medication for a long time following their previous bout of pneumonia.
Regarding your main concern: Yes, it is possible to catch the flu again.
The flu has different strains (such as Type A and Type B). A person can recover from one strain and subsequently get infected with another. Additionally, even if it is the same strain, a high level of viral exposure before the body has fully developed antibodies (right after recovery) can lead to re-infection. Since there is a family member currently sick with the flu in the same house, there is a risk of re-infection, even if they don't eat together.
Here is what you should do right now:
Track symptoms: Keep a record of your child's temperature, the time of the readings, and their overall activity level (such as playfulness, fluid intake, and urination).
Push fluids: Offer small amounts of water or hydrating fluids every 5 to 10 minutes.
Keep them comfortable: Dress your child in light clothing and maintain a comfortable room temperature. Avoid physical cooling methods like wiping them down with tepid water, as this can cause shivering.
Use fever reducers: If your child is uncomfortable, administer an age- and weight-appropriate antipyretic (fever reducer), making sure to follow the correct dosage intervals.
Isolate: Keep your child separated from the sick family member as much as possible. Use separate rooms, ventilate the house frequently, and ensure everyone practices strict handwashing.
When to see a doctor immediately:
Please bring your child in for a same-day evaluation at a pediatrician or urgent care if you notice any of the following red flags:
Difficulty breathing or chest retractions (the skin pulling in under the ribs).
No urination for 8 hours or more.
Extreme lethargy, lack of eye contact, or poor responsiveness.
Blue lips or pale, cold hands and feet.
Complaints of chest or severe abdominal pain.
A fever that lasts for more than 24 hours or stays at/above 39.5°C (103.1°F).
Will a re-test be needed?
If your child exhibits any of the warning signs listed above or has a high fever for more than 48 hours, the doctor may consider re-testing for the flu or ordering a chest X-ray.
If it is a mild, fluctuating fever (37.5–38°C or 99.5–100.4°F) and your child is still playing well, it may just be the lingering "tail end" of the previous viral infection. In this case, an immediate re-test might not be necessary.
Special caution regarding the pneumonia history:
Because your child had pneumonia a few months ago and has been on long-term medication, you must pay close attention to their respiratory symptoms. If you notice a worsening cough, shortness of breath, or a change in the color of their phlegm, they require a same-day medical evaluation.
In summary, re-infection is a possibility due to the presence of another sick individual in the home. For now, focus on hydration, administering fever reducers if they are uncomfortable, and closely observing their symptoms. If any warning signs appear or the fever persists for over 24 hours, please seek an in-person medical evaluation promptly.
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
