The allergens associated with a pear allergy are called Pyr c 1, Pyr c 3, Pyr c 4 and Pyr c 5.
Most people suffering from this allergy are thought to be sensitised to the protein Pyr c 1, which is similar in shape to Bet v 1 which is a protein found in birch pollen. This can cause cross reactions with other fruit.
You may have Pollen-Food Allergy Syndrome if you suffer from pear allergy with oral allergy symptoms to 3 or more of the foods mentioned in cross reactivity section.
If sensitised to Alder pollen you may have Pollen Food Allergy Syndrome and may also react to Apple, Peach, Cherry, Parsley, Celery, Almonds, and Hazelnuts
If sensitised to Birch pollen you may have Pollen Food Allergy Syndrome and may also react to Kiwi, Cherry, Peach, Plum, Nectarine, Apricots, Apple, Tomato, Celery, Carrot, Potato, Parsnip, Pepper, Dill, Cumin, Peas, Coriander, Fennel, Hazelnut, Walnut, Almonds, Peanuts, Lentils and Beans