fish allergy
... that people with a fish allergy are unlikely to be allergic to shellfish, because fish and shellfish do not have the same allergenic protein?
... that people with a <b id="mwCew"><a href="./Fish_allergy" id="mwCe0" rel="mw:WikiLink" title="Fish allergy">fish allergy</a></b> are unlikely to be allergic to shellfish, because fish and shellfish do not have the same allergenic protein?