Q: Is it safe to take my 5-year-old on a 5-hour car trip the day after getting a flu shot and having a mild fever?
Updated: Sep 7
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:
I got my 5-year-old vaccinated for the flu around noon today. I completely forgot that we have a 5-hour long car drive tomorrow for the holidays. Without thinking, I got them the shot. Around 9 PM, their temperature went up to 38.0°C. I put a cooling patch on them, and the fever dropped to 37.5°C by 10 PM.
I've heard that immunity can temporarily drop after a flu shot, making children more prone to getting sick. What can I do to maintain my child's condition during the long trip? I am planning to prepare some warm pear juice for them to drink in the car.
Answer:
It is understandable to be worried about a long trip right after a flu vaccination, but fortunately, it sounds like your child's fever is already going down.
First, a mild fever (37.5°C - 38.0°C) within 24 to 48 hours after vaccination is a completely normal immune response. Rather than a drop in immunity, this is actually a sign that your child's immune system is working properly to build protection. Most children recover naturally within 1 to 2 days.
To ensure your child stays comfortable during the trip tomorrow, here are a few steps you can take:
Preparation Tonight & Before Departure
Make sure your child gets plenty of sleep tonight, eats a light meal, and stays well-hydrated.
Before hitting the road, check their temperature again and pack a children's fever reducer (such as acetaminophen syrup) just in case.
Car Ride Planning
Plan to stop at a rest area every 2 hours to let your child stretch and get fresh air.
Bring plenty of water, electrolyte beverages, and light snacks.
Keep a thermometer, extra clothes, and towels easily accessible in the car.
To prevent motion sickness, ensure good ventilation in the vehicle and have them sit where they can look out the window.
Comfort in the Car
Warm pear juice is an excellent idea! Warm fluids will help soothe them.
Dress your child in comfortable, loose-fitting clothing and use a neck pillow to help them rest.
Bring along their favorite books or quiet, low-energy activities to keep them entertained without overstimulating them.
When to See a Doctor:
While mild symptoms are expected, please seek medical attention if your child develops a persistent high fever (over 39.0°C), experiences vomiting or a severe headache, or shows unusual lethargy and extreme fussiness.
Most children are perfectly fine to resume normal activities the day after a vaccination. Simply monitor your child's condition closely, avoid rushing, and adjust your travel schedule if they seem overly tired. Have a safe trip!
For extra peace of mind and clear guidance when tracking your child's symptoms, the FeverCoach app is always there to help.
