A.C.T.I.S.
The AIDS Clinical Trials Information Service is your central resource for current information on federally and privately funded clinical trials for AIDS patients and others infected with the human immunodeficiency virus (HIV). AIDS clinical trials evaluate experimental drugs and other therapies for adults and children at all stages of HIV infection -- from patients who are HIV positive with no symptoms to those with various symptoms of AIDS. A service of the US Department of Health and Human Services.

HIV Prevention Trials Network
The HPTN is a worldwide collaborative clinical trials network established by the NIH to evaluate the safety and efficacy of non-vaccine prevention interventions, alone or in combination, using HIV incidence as the primary endpoint.

HIV Vaccine Trials Network
Conducts all phases of clinical trials, from evaluating candidate vaccines for safety and the ability to stimulate immune responses, to testing vaccine efficacy. Formed in 1999, by the Division of AIDS (DAIDS) of the National Institute of Allergy and Infectious Diseases (NIAID).

Step Studies
This site is dedicated to The Step Study (HVTN 502/Merck 023) a phase IIb proof-of-concept vaccine trial.