“…The etiologic factors include food allergens, contact sensitivity to ointments, skin infection with both bacteria and yeasts, and inhalant allergens. 45,46 The letter from Salt et al 46 in this issue of the Journal strongly reinforces the idea that allergen sensitization is almost universal in the severe forms of the disease. Interestingly, there are striking differences in the circulating T cells in patients with AD that relate to their cell surface markers, their regulatory activity, and their in vitro responses to allergens.…”