Fill me in on oral allergy syndrome?

Fresh food allergy: Oral allergy syndrome is due to allergy to allergens in fresh fruit and vegetables. In most cases skin testing will be positive only when testing with fresh food, not with cooked foods or medical extracts. Symptoms are usually limited to itchy mouth and throat, rarely progressing to more severe reactions. Some reactions are due to crossreactivity between pollen such as ragweed and cantaloupe.