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            Fish Allergy

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            27/11/2021
            Shellfish Allergy
            15/12/2021
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            Fish Allergy

            Published by Dr Josรฉ Costa at 15/12/2021

            Although ๐Ÿ๐ข๐ฌ๐ก ๐š๐ฅ๐ฅ๐ž๐ซ๐ ๐ฒ is common, fortunately, it is not as common as other allergies.โฃ

            Its incidence varies from country to country, and around 40% of people with fish allergy had their first reaction when they were adults.โฃ

            In ๐˜Œ๐˜ถ๐˜ณ๐˜ฐ๐˜ฑ๐˜ฆ, less than 0.1% of children have a fish allergy.โฃ

            • The protein causing most of the allergic reactions is calledย ๐๐š๐ซ๐ฏ๐š๐ฅ๐›๐ฎ๐ฆ๐ข๐ง, and it exists in the fishโ€™s muscle.โฃ
            • Some species will have other allergens, which might also lead to allergic reactions.โฃ

            ๐‚๐จ๐ has been the primary source of studies and information regarding fish allergy.โฃ

            Though most fishes contain this protein, this ๐ƒ๐Ž๐„๐’ ๐๐Ž๐“ mean that an allergy to a fish will lead to an allergy to all fish.โฃ

            • Expect to have cross-reactions between fish in the same family (see the tables I made) but to a lesser extent between fish from different groups.โฃ
            • Studies show that, in this case, the cross-reactivity is moderate or small.โฃ

            If there were no specific allergens on the table I made, it is because none has been identified yet, though some proteins have been.โฃ

            Some main aspects to note are the following:โฃ

            1. ๐„๐ž๐ฅ and ๐œ๐จ๐ likely cross-reactโฃ
            2. ๐€๐ง๐œ๐ก๐จ๐ฏ๐ฒ and ๐œ๐จ๐ cross-sensitivity is found in nearly 35% of childrenโฃ
            3. ๐€๐ง๐œ๐ก๐จ๐ฏ๐ฒ has a high content of ๐˜ฉ๐˜ช๐˜ด๐˜ต๐˜ข๐˜ฎ๐˜ช๐˜ฏ๐˜ฆ, so some reactions might not be allergicโฃ
            4. ๐…๐ข๐ฌ๐ก ๐ ๐ž๐ฅ๐š๐ญ๐ข๐ง๐ž is used in medication, like in ๐˜ท๐˜ข๐˜ค๐˜ค๐˜ช๐˜ฏ๐˜ฆ๐˜ด, but generally do not lead to a reaction in people who are allergic to fishโฃ
            5. Fish allergies typically are ๐ฅ๐ข๐Ÿ๐ž๐ฅ๐จ๐ง๐ โฃ

            There are cases in which an apparent allergic reaction to fish has normal investigations.โฃ

            • In some cases, this might be due to the presence of a parasite called ๐€๐ง๐ข๐ฌ๐š๐ค๐ข๐ฌ.โฃ
            • Investigation for this parasite should be done through blood tests.โฃ

            Final note:โฃ
            Think of the fish in a ๐˜ง๐˜ช๐˜ด๐˜ฉ ๐˜ต๐˜ข๐˜ฏ๐˜ฌ!

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            Dr Josรฉ Costa
            Dr Josรฉ Costa

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