Diagnosis of immediate allergic reactions to beta-lactam antibiotics.

Allergic reactions to betalactams are the most common cause of adverse drug reactions mediated by specific immunological mechanisms. Reactions may be induced by all betalactams currently available, ranging from benzylpenicillin (BP) to other more recently introduced betalactams, such as aztreonam or the related betalactamase-inhibitor clavulanic acid (Fig. 1) (1–5). Although the production process of betalactams has improved over the years, the number of reactions has not decreased, M. J. Torres, M. Blanca, J. Fernandez, A. Romano, A. de Weck, W. Aberer, K. Brockow, W. J. Pichler, P. Demoly for ENDA, and the EAACI interest group on drug hypersensitivity Allergy Service, Carlos Haya Hospital, Malaga, Spain; Allergy Service, University La Paz, Madrid, Spain; Allergy Section, Dept. Clin. Med., UMH, Elche, Spain; Allergy Service, Catholic University of Rome, Italy; Fondation Gerimmun, Beaumont 18, CH1700, Fribourg, Switzerland; Department of Environmental Dermatology, Graz, Austria; Klinik und Poliklinik f5r Dermatologie und Allergologie, Muenchen, Germany; Clinic for Rheumatology and Clinical Immunology/Allergy, Inselspital, Bern, Switzerland; Maladies Respiratoires-INSERM U454, Hopital Arnaud de Villeneuve, Montpellier, France