According to WebMD WebMD WebMD WebMD Web MD: Allergy Statistics and Facts http://www.webmd.com/allergies/allergy-statistics WebMD http://www.webmd.com/allergies/allergy-statistics http://www.webmd.com/allergies/allergy-statistics WebMD source 55% of the U.S. population alergias http://www.webmd.com/allergies/allergy-statistics WebMD