Colonization with imipenem-resistant Acinetobacter baumannii (IBA) is an unfavorable event for the patient, especially in intensive care. Indeed, it exposes the patient to the risk of developing serious infections, extremely difficult to treat. ABRI is a particularly resistant bacterium in the environment. When an ABRI epidemic occurs in a department as central to the hospital as a surgical resuscitation department, the control of such an event can be extremely complex. There are few clear and detailed descriptions in the literature of how to manage this type of outbreak, let alone an ABRI outbreak of this magnitude.

Inclusion criteria:

• Major subject (≥18 years old)
• Patient having been hospitalized in the surgical resuscitation service of Hautepierre during the ABRI epidemic, between 01/05/2015 and 01/01/2019 inclusive and having been colonized and/or infected by ABRI (according to bacteriological results transmitted to the hygiene service).
• Subject having given his/her agreement, after information, for the reuse of his/her data for the purpose of this research

Exclusion criteria:

• Subject having expressed his opposition to participate in the study
• Subject under guardianship or curatorship
• Subject under legal protection

Major subject (≥18 years old) having been hospitalized in the surgical resuscitation service of Hautepierre during the ABRI epidemic, between 01/05/2015 and 01/01/2019 inclusive and having been colonized and/or infected by ABRI