Is crab in the same family as shrimp newly and severely allergic to shrimp. I discovered ten years ago my allergies began change. wondering if its safe eat crab?

While shrimp and crab are both crustaceans, they belong to different families and are not closely related. Shrimp are in the order Decapoda, which includes animals like lobsters, crayfish, and prawns. Crabs, on the other hand, are in the order Decapoda but belong to a different suborder, Brachyura.

As for your allergy, it's possible that you may have developed a new allergy to crab, even if you were not allergic to it in the past. It's important to note that allergies can develop over time and can be triggered by even small amounts of the allergen. If you are severely allergic to shrimp, it's best to consult with an allergist to discuss your specific situation and whether it's safe for you to eat crab. The allergist can perform allergy testing to determine if you have an allergy to crab or other shellfish.

For safety, it's generally recommended to avoid any foods you're allergic to, even if they are not closely related to the food that originally caused the allergy. In the case of shellfish, some individuals may be allergic to certain species but not others. For example, someone allergic to shrimp may be able to tolerate crab, or vice versa. However, it's best to discuss this with an allergy specialist to determine what is safe for you.