CDC recommends universal HIV testing in all adults, at least once during life, to reduce the pool of infected patients unaware of their status. Routine universal HIV testing can use "classical" ELISA tests from serum, or rapid tests, ideally from finger-stick whole blood (FSB), which have shown close predictive values from classical tests. The investigators will compare the acceptability and feasibility of the two methods.

The multi-center prospective randomized study will compare the acceptability and feasibility of routine universal HIV testing to adult patients consulting their general practitioner in Paris, France, using either the " classical " ELISA tests from serum or rapid tests from FSB (Insti®).

Inclusion Criteria:

• adult patients consulting their general practitioner in Paris, France

Exclusion Criteria:

• patients previously known as HIV-positive,
• patients who declare having been tested HIV-negative less than three months ago,
• patients who can not give informed consent