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Scheduled Maintenance: CDAS will be undergoing maintenance on Saturday, February 7th from 7:30 AM to 9:30 AM U.S. Eastern Standard Time for updates to the website. During this time you may experience intermittent downtime.

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The National Institutes of Health (NIH) has implemented new IT security requirements to improve data security. This mandate includes integration of identity verification into NIH IT applications. On March 3, 2026, you will be required to verify your identity in order to access CDAS.