Seafood and fish allergies can be easily tested on a blood test. Your GP should ask the local pathology lab (Pathcare, Ampath or Lancet) to do a Seafood RAST test on a blood sample and then if positive they can test for allergy to the individual fish, and shellfish and clarify the situation. If your daughter is still very allergic to cod fish (as in fish fingers), it is advisable to take an Epipen Adrenaline auto-injector on your travels and learn the local translation for "seafood" to advise any food vendors that she has fish anaphylaxis.
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