Individuals with reaction to specific allergens to foods, inhalants or substances can be known to develop allergy to others and it is becoming better recognised that reactions are occurring to different foods containing either the same allergen, or an allergen with a very similar protein structure. Reactions can be either light or heavy and this is known as allergic cross-reactivity.

This means that someone may suffer an allergic reaction even when they’re avoiding the foods they know they’re allergic to. If someone is allergic to peanuts, for example, they might react to soya, peas, lentils or beans which are food items in the same biological family (legume). Allergic cross-reactions can also happen between certain fruit or vegetables and latex (known as latex-food syndrome), or the pollens that cause hayfever.

If a person has a measurable reaction to a certain food with clinical diagnosis, advice to avoid similar foods that could trigger this reactionmight be helpful.

The most well-documented cross-reactivity is the one which occurs between apple and birch pollen. Nevertheless, individuals allergic to apple are not necessarily allergic to birch pollen. Cross-reactivity should not be assumed and important foods be eliminated from the diet without appropriate testing and clinical diagnosis.

 

ALLERGEN CLINICAL RELEVANCE FREQUENT OCCURENCE POSSIBLE OCCURENCE
Aniseed Light Mugwort Birch, weeping
Apple Medium Birch, weeping Celery
Cherry
Cocksfoot
Mugwort
Peach
Pear
Potato
Ragweed, common
Rye-grass
Tomato
Alder Pollen Medium   Almond
Apple
Celery
Cherry
Hazelnut
Parsley
Peach
Pear
Ash, Common Light Birch, weeping
Lilac, common
Olive
Privet, common
Ragweed, common
Timothy
Avocado Medium Latex Banana
Kiwi
Banana Heavy Latex Avocado
Birch, weeping
Goose-foot Kiwi
Melon
Bermuda Grass Light Blue grass, (Kentucky)
Cocksfoot
Reed, common
Ryegrass, perennial
Timothy
Celery
Olive
Rape, oilseed
Rye-grass
Sunflower, common
Birch pollen Medium   Almond
Apple
Apricot
Buckwheat
Carrot
Celery
Cherry
Coriander
Fennel
Hazel nut
Honey
Kiwi
Nectarine
Parsley
Parsnip
Pear
Peach
Peanut
Pepper
Plum
Potato
Prune
Spinach
Walnut
Wheat
Birch, weeping Heavy Apple
Ash, common
Beech, common
Carrot
Celery
Chestnut, sweet
Cob, hazel
Curry
Hornbeam, common
Kiwi
Oak, English
Pear
Tomato
Aniseed
Banana
Elm, Scottish
Caraway seed
Chamomile, German
Cherry
Coriander
Fennel seed
Hazelnut
Latex
Lychee
Mango
Mugwort
Olive
Orange
Paprika, condiment
Parsley
Peach
Pepper
Potato
Rape, oilseed
Rye-grass
Soy beanTimothy
Carrots Heavy Birch, weeping
Celery
Mugwort
Cucumber
Head Lettuce
Mango
Melon
Cherry Light   Birch, weeping
Apple
Peach
Chicken Egg Heavy Canary (serinus canarius)
Chicken
Duck, domestic
Goose, domestic
Hen, domestic
Parrot, African gray (psittacus erithacus)
Parakeet (nmphicus hollandicus) feathers
Parakeet (Melopsittacus undulatus)
Pigeon
 
Cocksfoot Grasses Heavy Bermuda grass
Blue grass, (Kentucky)
Melon
Oat flour
Rye flour
Ryegrass, perennial
Timothy
Vernal grass, scented
Apple
Meadow, fescue
Oats, common
Reed, common
Rye-grass
Cod Fish Light   Carp
Eel
Herring
Mackerel
Plaice
Salmon
Sole
Tuna fish
Corn Light   Barley
Blue grass, (Kentucky)
Millet
Oats, common
Soy bean
Ryegrass, perennial
Rice
Wheat, common
Crab Light   Oyster
Shrimp
Squid
Cucumber Light Celery Carrot
Melon
Curry Mixed Spices Medium Birch, weeping
Celery
Mugwort
 
Edible Chestnut Medium Latex  
Fennel Seed Light   Birch, weeping
Celery Mugwort
Grape Light   Peach
Grass pollen Medium   Melon
Orange
Swiss chard
Tomato
Watermelon
Wheat
Hazelnut Heavy Cob, hazel Birch, weeping
Kiwi
Mugwort
Peach
Poppy seed
Rue flour
Sesame
Kiwi Fruit Medium Birch, weeping
Latex
Timothy
Avocado
Banana
Hazelnut
Mugwort
Poppy Seed
Rye flour
Ryegrass, perennial
Sesame
Latex Rubber Heavy Avocado
Banana
Edible Chestnut
Ficus benjamini (Tropic laurel, Weeping fig)
Kiwi
Mango
Melon
Papaya
Tomato
Apple
Birch, weeping
Buckwheat
Carrot
Celery
Dill
Fig
Mugwort
Orange
Oregano
Passion fruit
Peach
Peanut
Pear
Pineapple
Potato
Ragweed, common
Rye-grass
Sage
Soy bean
Strawberry
Timothy
Walnut
Lentil Light   Pea
Walnut
Lychee Light   Birch, weeping
Melon Medium Celery
Cocksfoot
Latex
Ragweed, common
Banana
Carrot
Cucumber
Goose-foot
Plantain, English
Zucchini
Mugwort pollen Medium   Carrot
Celery
Coriander
Fennel
Melon
Parsley
Pepper
Spices
Sunflower
Watermelon
Onion Light   Asparagus
Garlic
Timothy
Orange Heavy   Birch, weeping
Papaya Light Latex  
Paprika
Condiment
Light   Birch, weeping
Celery
Mugwort
Pea Light   Lentil
Mugwort
Peanut
Peanut Heavy Tomato Latex
Lentil
Mugwort
Parietaria
Pea
Peach
Soy bean
Pear Medium   Apple
Birch, weeping
Mugwort
Peach
Pepper Light   Celery
Birch, weeping
Mugwort
Pineapple Light   Latex
Rye-grass
Poppy Seeds Light   Hazelnut
Kiwi
Rye flour
Pork Medium Cat, domestic  
Potato Light   Apple
Birch, weeping
Latex
Tomato
Ragweed pollen Medium   Apple
Banana
Cantaloupe
Chamomile tea
Honey
Honeydew
Nuts
Sunflower
Watermelon
Tomato Light Birch, weeping
Peanut
Rye-grass
Timothy
Apple
Celery
Latex
Mugwort
Potato
Walnut Light   Peach