HIV Databases HIV Databases home HIV Databases home
HIV sequence database

Defining New CRFs


New CRFs will be numbered sequentially as they become known to us. Please contact us if you have what you believe to be a new CRF.

Files needed

Because there may be more CRFs in press, and because some authors keep their sequences embargoed until publication, you must send us:

Following receipt of this information, a new number will be issued. If you wish, we will keep all information embargoed until publication.


In order for a new CRF to be defined, the current requirements are based on the 1999 Nomenclature system:

In the future, we may establish more stringent criteria to define new CRFs. Please check back for updates.

More Information

The Recombinant HIV-1 Drawing Tool provides a handy way to produce a quality drawing of your CRFs and URFs.

Return to the CRF page.



last modified: Tue Feb 22 12:55 2022

Questions or comments? Contact us at

Operated by Triad National Security, LLC for the U.S. Department of Energy's National Nuclear Security Administration
© Copyright Triad National Security, LLC. All Rights Reserved | Disclaimer/Privacy

Dept of Health & Human Services Los Alamos National Institutes of Health