[Primary allergy prevention: partially or extensively hydrolyzed infant formulas?].

The natural history of allergic disease and its potential for prevention merit close examination because of the explosive worldwide increase in the prevalence and morbidity of atopic disorders. In infants from ''high-risk'' families (i.e. those with one or two parents and/or a sibling with food allergy, eczema, asthma or allergic rhinitis) food allergen avoidance has been advocated as means of preventing the development of atopic disease. The aim of this review was to evaluate the allergy preventive potential of partially or extensively hydrolyzed formulas. When breast-feeding is not possible or supplemental feeding is needed, infants from atopic families should be given a hydrolyzed infant formula for the first 6 month of life. High-risk infants without a history of eczema in a primary relative will receive the protective effect from the less expensive partial hydrolyzed formula (p-HF); whereas those infants who have first-degree relatives with eczema should receive the extensively hydrolyzed formula (e-HF).