GAVI, the global vaccine alliance, said it signed agreements with China's Sinopharm and Sinovac on Monday for immediate COVID-19 vaccine supplies to the COVAX program. 

"The agreements, which come at a time when the Delta variant is posing a rising risk to health systems, will begin to make 110 million doses immediately available to participants of the COVAX Facility, with options for additional doses," GAVI said in a statement.