CLEAN : White House on expanded sanctions on Belarus, Covid Omicron variant in US

The transcript covers several topics: the U.S. is ready to provide more vaccine doses to South Africa, sanctions have been imposed on Belarus due to political repression, a COVID-19 case in Minnesota linked to a convention in New York, and new measures to combat COVID-19, including a booster campaign and family clinics.

What is the significance of the open communication mentioned regarding vaccine doses to South Africa?

What role does the CDC play in contact tracing as mentioned in the text?