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Q: My child had Type A flu 25 days ago, and now the father has it. What is the probability of the child getting reinfected?

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 was diagnosed with the flu on December 3rd. Today, the father was diagnosed with the flu. Since it has only been 25 days, is there a high chance of my child getting reinfected from the father? Both the children's previous infection and the father's current infection are Type A flu.


Answer:

It is completely understandable to be worried about the possibility of flu reinfection in your household.


Evaluation of Reinfection Probability

If both infections are caused by the exact same subtype of Influenza A, the chance of reinfection after just 25 days is very low. Once a person is infected, they typically develop temporary immunity to that specific subtype for the remainder of the flu season.


Important Points to Consider

  • Influenza A has several different subtypes, such as H1N1 and H3N2.

  • If the father is infected with a different subtype than what the children originally had, reinfection is entirely possible.

  • Multiple subtypes are often circulating at the same time during the flu season.


Recommended Preventive Measures

  1. Minimize direct contact between the father and the children. It is best if everyone wears masks when sharing the same space.

  2. Practice frequent handwashing, and make sure to use separate towels, dishes, and utensils.

  3. Support the children's immune systems by ensuring they get plenty of sleep, rest, and good nutrition.


What to Monitor

  • If the children begin to show symptoms such as fever, cough, or body aches, please take them to a doctor immediately.

  • Seek emergency medical care right away if they experience a high fever that won't come down or if they show signs of difficulty breathing.


In most cases, reinfection with the exact same flu strain does not occur within such a short timeframe, so try not to worry too much. However, it is highly recommended to strictly follow these preventive measures and consult your pediatrician for an in-person evaluation if any new symptoms arise.


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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