My dad was eating peanut butter with bread for breakfast when I was three years old, he was touching the food I was eating and I started to break out in intensive hives all over my body. That’s when my parents took me to the hospital. Eventually we did overcome my allergy, a few relatives had kids with the same allergy so everyone was very accommodating to produce allergy safe foods.
The only medicine taken was Benadryl when the reaction was not life threatening (hives on skin) but an EpiPen was administered for me when it was clear the reaction was anaphylactic and life threatening.