Hello and thanks for the query
This could be a side effect of the flu
shot but could be stopped by the time. But as WBC
is high it indicated infection most provably GI track infection. Follow certain precautions like:
1. Give only fresh milk or food to your child.
2. Clean the hand properly before meals.
3. Keep your child hydrated. Give boiled water or RO filtered water with ORS
4. Keep a check on urine output.
Consult your Physician for proper antibiotic course. Hope this will help you.