Given the ongoing pandemic, the 28th Conference on Retroviruses and Opportunistic Infections will be held virtually from March 6 to March 10, 2021. As always, the best and most consequential original research will define the science at virtual CROI 2021, which will include research in HIV, hepatitis viruses, SARS-CoV-2, and other viral infections and their related conditions.   

Unique this yearonly registered attendees will have access to the meeting content during and after the conference. vCROI 2021 will have live interactive and engaging sessions in a variety of formats, networking, rich program of on-demand content that will be released each day, and other conference materials. Additionally, registered attendees will be eligible to claim CME credit, ABIM MOC points, and Certificate of Participation, and will have enduring access to the on-demand materials after the conference. 

Unlike previous years, access to on-demand presentations and materials will not be available to the public until 6 months after the conference. Additional details will be available after the conference ends. 

Apply or Register to Attend

The registration and application system is now open.

Early Registration (until 2/18/2021) Regular Registration (after 2/18/2021)
virtual CROI 2021 US $495  US $650

Registration includes exclusive access to live and on-demand components of the conference including presentations, materials, and continuing medical education credits.

CROI 2020 paid registrants may be eligible to receive a US $200 credit for CROI 2021. This credit can be applied to your registration fee or be directed to support the CROI New Investigator Scholarship fund.


virtual CROI 2021 Backpack

Because CROI 2021 will be held virtual and in order to keep costs to registrants low, backpacks and other conference accessories will not be provided as part of the registration fee. However, registrants may order an iconic virtual CROI 2021 backpack separately. The backpack is $30 plus the shipping cost, which is based on your location. The backpack itself will not be revealed or shipped until after the conference concludes. Alternatively, if you have an account with a shipping company (eg, FedEx, DHL), you can contact us directly to purchase the backpack and provide your shipping account information. Please email the information to The deadline to order the backpack is on February 18, 2021.


Please read carefully.

  • Applications are generally reviewed within 2 or 3 business days of submission. Email confirmations are sent after the review process has been completed.
  • Individuals are required to complete their own applications to ensure that the information is accurate and complete.
  • Registration substitutions are prohibited.
  • Requests for conference registration fee refunds must be received by February 22, 2021, and are subject to a US $50.00 non-refundable administrative fee.
  • Terms and Conditions