allergic (adj)

I am allergic to peanuts.
Sarah is allergic to peanuts, so she always checks food labels to ensure there are no traces of peanuts in the ingredients.
During the spring, many people experience allergic reactions to pollen, resulting in symptoms like sneezing and itchy eyes.
He discovered he was allergic to cat fur when he visited a friend's house and developed a rash and difficulty breathing after spending time with the cat.