Drug provocation tests (DPT) are widely in case of suspicion of drug hypersensitivity (and in the absence of contraindications), but there are no standardized protocols and most groups use hypothesis (clinically-driven) protocols.

investigators used 20 year experience in drug hypersensitivity to analyse retrospectively 171 patients (accounting for 182 positive DPT to beta-lactams). Using survival analysis, they identified optimal doses to include in a data-driven protocol. This data-driven protocol will be applied to new prospective patients, to test its safety and benefits (gain in time, hospital and patient benefits).

Inclusion Criteria:

• patients with positive Drug Provocation Test (DPT) to beta-lactams

Exclusion Criteria:

• contra-indications to DPT
• refusal of participation
• vulnerable patients according to French regulation