The Step Study
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About the Step Study
An HIV Vaccine Trial

We are looking for an effective and safe vaccine against HIV/AIDS. Each year, more than 4 million people become infected with the HIV virus. A preventive vaccine against HIV offers the best hope in ending this worldwide epidemic. The Step Study is part of an international effort to test and find an HIV vaccine that will work safely in diverse populations.

Finding a safe and effective HIV vaccine that will protect people is a formidable task. We cannot do it without the help of volunteers.

  • Participants in the study will NOT be at risk for HIV infection from the vaccine.

  • A total of 3,000 people will participate in the Step Study.

  • The Step Study is being conducted in the United States, Australia, Brazil, Canada, Dominican Republic, Haiti, Jamaica, Puerto Rico and Peru.



See news articles on the Step Study Safety is the primary goal of the Step Study. This is a Phase II study, designed to yield limited information on the efficacy of the vaccine. The Step Study vaccine has been found to be safe in animals and humans in previous trials. The Step Study vaccine is made from an inactivated cold virus known as an adenovirus. The vaccine does NOT contain the HIV virus, and CANNOT cause HIV infection. Since the vaccine is not yet proven to prevent HIV infection, we urge our volunteers to practice safe sex.