Resolution rates of IgE-mediated cow's milk allergy (IgE-CMA) by age 5 years, and risk factors for its persistence were previously described. To extend follow-up until the end of adolescence. An extension study of 23 of 54 patients diagnosed with IgE-CMA from a population-based study of 13,019 newborns, who remained allergic at age 5 years. Patients were examined at age 17 and their history reviewed. Resolution was determined by regular milk consumption without adverse reactions, or a negative oral food challenge (OFC). Allergy was defined by a recent objective reaction to milk and a positive skin prick test (SPT), or by sensitization ≥95% PPV to milk. Risk factors for persistence at age 17 were examined in the entire cohort. Of the 23 patients followed, 8/23 (35%) had spontaneous resolution, and 15 had persistent IgE-CMA. Overall, 39 (72.2%) of the 54 patients initially diagnosed with IgE-CMA had spontaneous resolution by age 17. Risk factors for IgE-CMA persistence at age 17 years included SPT >6 mm at time of diagnosis (p=0.03), no cow's milk formula feeding in the nursery (p=0.008), and wheezing on diagnostic OFC/initial reaction to milk (p=0.04). Seven patients experienced objective reactions after age 5 years. These patients had more wheezing (p=0.045) or anaphylaxis (p=0.02) on diagnostic OFC/initial reaction and more current asthma (p=0.007). Significant rate of spontaneous resolution of IgE-CMA still occurs beyond age 5 and few patients with IgE-CMA, mostly asthmatics, experience objective reactions by early adulthood. This should be considered in the treatment approach of IgE-CMA patients.
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