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Mosaico is a large study that will try to prove whether the experimental vaccine regimen can prevent HIV infection in North America, Latin America, and Europe. To do this, the study will enroll cisgender men and transgender persons who have sex with cisgender men and/or transgender persons. If Mosaico can show that the study vaccine regimen works, it will be a very important step on the way to finding a safe and effective vaccine for the prevention of HIV.

To join this study, participants must be

  • healthy
  • HIV-negative
  • between 18 and 60 years old

These participants must be willing to have medical check-ups and regular HIV counseling and testing. There are also other criteria that must be met for a person to be eligible to join the study.

If you have chosen to use HIV pre-exposure prophylaxis (PrEP), you are not eligible for this study, as PrEP, when taken correctly, is a highly effective HIV prevention method. If you are interested in accessing PrEP, we can help link you to services.

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We are currently looking for 3800 cisgender men and transgender persons who have sex with cisgender men and transgender persons. Study clinics will screen volunteers to see if they are eligible to enroll.

With your consent, we will collect and use information you submit here to indicate your interest in the study and to provide more information about the study. Your personal information may be stored and processed in any country where we have facilities or service providers, and by using our Service or by providing consent to us (where required by law), your information may be transferred to countries outside of your country of residence, including to the United States, which may provide for different data protection rules than in your country of residence. Nonetheless, appropriate contractual and other measures are in place to protect personal information when it is transferred to our affiliates or third parties in other countries.

The information will be sent first to our website provider who will share it with the study site you selected so that they may contact you about participation in this study. You may withdraw your consent at any time by contacting [email protected] or contact the study clinic you have been in touch with and if you cannot find that number please email us at [email protected]. Please read our Privacy Policy.

Please note: questions marked with an "*" are required in order to submit the form.

The best way to contact me is: *

(choose at least one)

What pronouns do you use?

(check all that apply)

How did you hear about this research?

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Have you ever participated in an HIV prevention study before?
Would you be able to attend study visits for at least one year?