beta-lactam hypersensitivity reactions are classified as immediate or nonimmediate. Diagnosis is usually based upon skin tests and provocation challenges.
Exploration des Allergies, Service des Maladies Respiratoires, Hôpital Arnaud de Villeneuve, University Hospital of Montpellier; INSERM U454-IFR3, Hôpital Arnaud de Villeneuve, Montpellier, France.