Thank you for your query on Healthcare Magic.
Don't worry about the school opening and you can postpone his journey and school on medical grounds.
Health is important and the rest is secondary.
Discuss with your doctor regarding the present condition and the propbable diagnosis and precautions to be taken for the betterment of your child health.
If the child is active, no vomitings and no fever
, and if the reports are normal, you can continue the journey as planned.
Hope I have answered your query, if you have any clarification please let me know.