Specific IgE levels do not indicate persistence or transience of food allergy in children with atopic dermatitis.
BACKGROUND
Food allergy in early childhood usually resolves with time; however, little is known about predictors for persistence or transience of food allergy in children with atopic dermatitis. The aim of the study was to evaluate whether specific IgE levels in serum could be a useful predictor of the outcome of oral re-challenges.


METHODS
In 74 children, 99 oral food challenges were performed (cow milk n = 48, hen egg n = 37, and wheat n = 14) and repeated after a median time interval of 16 months. In 15 of the 74 children, a third challenge (n = 22) could be performed, with a median time interval from second challenge to third challenge of 15 months.


RESULTS
There were 37 children with transient food allergy (positive first challenge and negative second challenge), while 62 children had persistent food allergy (positive first challenge and negative second challenge). Comparison of the two groups showed that specific IgE as well as total IgE in serum was significantly higher in the latter group. However, looking at the time course, specific IgE did not decrease significantly during elimination diet.


CONCLUSIONS
Our results indicate that specific IgE in serum--although very helpful at the time of the first diagnosis--cannot predict whether a chid will become tolerant after a period of avoidance. Therefore, oral re-challenges remain mandatory.
Niggemann
B
B
Dept. of Pneumology and Immunology, University Children's Hospital Charité of Humboldt University, Berlin, Germany. bodo.niggemann@charite.de
Celik-Bilgili
S
S
Ziegert
M
M
Reibel
S
S
Sommerfeld
C
C
Wahn
U
U
D003876:Dermatitis, Atopic / Q000276:immunology*; D004311:Double-Blind Method; D021181:Egg Hypersensitivity / Q000276:immunology; D005260:Female; D005512:Food Hypersensitivity / Q000276:immunology*; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood*; D007223:Infant; D008137:Longitudinal Studies; D008297:Male; D016269:Milk Hypersensitivity; D011237:Predictive Value of Tests; D021182:Wheat Hypersensitivity / Q000276:immunology
D007073:Immunoglobulin E