Fish allergy
Finned-fish allergy often spans several species because they share a protein called parvalbumin, but not always, and some people tolerate certain fish. Each guide below covers one fish; the cross-reactivity guides explain which fish travel together and why.
How these foods cross-react
If your child reacts to one, this is what else genuinely travels with it, and the shared-protein reason why.
- Food familyFinned fish cross-reactivityFinned-fish cross-reactivity is high and broad: one fish allergy often means several. Which fish cross-react, how 'fish' is labeled and named by species, why fish is not shellfish, and why some fish are a reason to test, not to assume. Cited.
- Shared proteinFish parvalbumin cross-reactivityParvalbumin is the shared muscle protein behind finned-fish cross-reactivity. Why one fish allergy often means several, why some fish carry less parvalbumin, and why fish is not shellfish. Cited.