title: New results and some remarks to the "angry back syndrome".
abstract: Forty patients who showed more than two positive reactions to a standard patch test series of 26 substances were retested subsequently with the allergens that had given positive responses; 13 of 151 reactions were negative in the repetition, that is, 8.6% in comparison with 42% in the investigations of Mitchell (1977) in which 38 of 90 reactions could not be reproduced. Possible causes of this difference are discussed.
mesh_terms: D000485:Allergens; D005189:False Positive Reactions; D006801:Humans; D010328:Patch Tests; D012882:Skin Tests
chemical_list: D000485:Allergens