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An indirect double-antibody enzyme-linked immunosorbent assay (ELISA) was developed for the measurement of human immunoglobulin E (IgE) and IgG to the cow's milk proteins (CMP) alpha-casein, alpha-lactalbumin, and beta-lactoglobulin. Human serum albumin was used as the negative-antigen control. Rabbit anti-human IgE or IgG served as the primary antibody, and horseradish peroxidase-conjugated swine anti-rabbit immunoglobulin served as the secondary antibody. Positive control sera were obtained from patients with well-documented histories of cow's milk allergy, while negative control sera were obtained from cord bloods of healthy full-term infants and from normal adult volunteers without known milk allergy. Test sera were obtained from 41 children (ages, 3 months to 13 years; average age, 2.6 years) with suspected cow's milk allergy and clinical manifestations that included wheezing, rhinitis, atopic dermatitis, urticaria, or gastrointestinal disturbances. The patients were simultaneously evaluated by prick skin testing with scratch test antigen to whole CMP. Although only 13 (32%) of the 41 patients were positive by the prick skin test, 25 (61%) were positive by the IgE ELISA. Of the 25 IgE ELISA-positive patients, 20 were also positive by the IgG ELISA. There was concordance of positive results between skin testing and the IgE ELISA in only 9 patients (22%), and there was concordance of negative results in 12 patients (29%). Discordant results were observed in 20 patients (49%). These results indicate that the ELISA is more sensitive than prick skin testing in the identification of individuals with elevated levels of IgE to CMP.

journal of clinical microbiology

Indirect enzyme-linked immunosorbent assay for measurement of human immunoglobulins E and G to purified cow's milk proteins: application in diagnosis of cow's milk allergy