Period 1: Retrospective period:

Collection of data from the 12 months preceding the start of the research of hospitalized patients:

• number of hospitalizations,
• number of HIV serologies performed,
• number of patients with socio-demographic criteria justifying HIV screening.

Start of research: Implementation of the "POP-UP" electronic alert

Period 2: Prospective period: 18 months POP-UP opens for patient who meet the eligibility criteria.

Six possibility to answer:

1. Patient accept to participate: patient is include and receive HIV serology during their hospitalization.
2. Not time to answer to the alert
3. Patient already has a serology less than 3 months old
4. Patient followed for a known HIV infection.
5. Patient who refused the test
6. Clinical condition of the patient not allowing his no opposition Only choice 1 include patient The response close the electronic alert, but it re-opens when the medical file is re-consulted (2/ and 6/) or new hospitalization.

Implementation of the "POP-UP" electronic alert for all patients with eligibility criteria

Evaluation of the practice of hospital doctors at Foch Hospital following the implementation of "POP-UP" electronic alert to encourage targeted screening for HIV infection according to specific socio-demographic criteria :

• Screening proposal rate (= number of proposition compared to number of eligible patients).
• Patient acceptance rate (= number of eligible patients acceptances compared to number of screening proposals).
• Serological achievement rate (= number of serologies compared to number of eligible patients).

Study of the obstacles encountered by clinicians in proposing screening tests induced by electronic alerting by questionnaire of satisfaction.