The registration and application process to attend virtual CROI 2021 is now open! To start your registration or application, visit and follow the “Apply or Register” button.

To ensure that you are eligible to attended CROI, you may review the Attendee Criteria page. Most answers to frequently asked questions are available on our FAQ page.

As always, the best and most consequential original research will define the science at virtual CROI 2021, which will include research in HIV and other emerging viral infections, such as hepatitis C virus and SARS-CoV-2. Virtual CROI 2021 will include 4.5 hours per day of live (real-time) interactive and engaging sessions in a variety of formats. In addition, a rich program of on-demand content will be released each day. Visit the Important Dates page for information about other important milestones for virtual CROI 2021.