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Q: Can my baby get a fever within 30 minutes of a DPT vaccination?

  • Myeongchan Kim
  • 7 days ago
  • 2 min read

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:

Can a fever occur within 30 minutes of getting a vaccination? My baby just had the DPT vaccine, and I am wondering if it can cause a fever that quickly. I am worried that I might have taken my child to get vaccinated while they already had a fever. Unfortunately, I didn't check their temperature beforehand, but right after we came back home from the clinic, their temperature was already 38°C.


Answer:

It is very rare for a fever to develop within 30 minutes after a DPT vaccination. It is highly likely that your baby already had a fever before receiving the shot.


[Current Situation Assessment]

• Vaccination-induced fever: Usually starts 4 to 24 hours after the injection.

• 38°C fever within 30 minutes: High possibility of an infection that was present prior to the vaccination.

• While the DPT vaccine commonly causes fever, the reaction does not appear this quickly.


[What You Should Do Now]

1. Check your baby's overall condition: Are they playing and eating well?

2. Check for other symptoms: Look out for coughing, runny nose, vomiting, or rashes.

3. Fever reducers are allowed: You can administer Tylenol (acetaminophen) if your baby is uncomfortable.

4. Hydration: Ensure your child drinks plenty of fluids.


[When to Visit the Hospital]

→ If a fever of 39°C or higher persists.

→ If there is severe swelling or redness at the injection site.

→ If your baby shows severe lethargy or extreme fussiness.

→ If there is difficulty breathing or hives appear (this is very rare, but requires immediate attention).


Since it is highly likely there was a mild infection prior to the vaccination, please manage it as a general fever while also keeping a close eye on the injection site. In most cases, the symptoms will improve within 2 to 3 days.



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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