5th February 2024

A 12-year-old male presents with swelling of his lips and difficulty in breathing

A 12-year-old male presents with swelling of his lips and difficulty in breathing. On examination, he also has a widespread erythematous rash. His mother informs you that he ate peanuts when the symptoms came on.

She reports that he has eaten peanuts once and has had no reaction.

Which of the following explains the most likely reason the boy did not have a reaction when he first consumed peanuts?

Select the SINGLE most appropriate option from the list below. Select ONE option only.