CNN  — 

The US Centers for Disease Control and Prevention will announce new metrics to guide Covid-19 restrictions such as mask-wearing on Friday, according to a senior CDC official.

CDC will hold a news briefing Friday afternoon to discuss changes to Covid-19 metrics.

“It’s time to shift from panic mode to cautiously moving forward,” a CDC scientist who is involved with the process told CNN on Thursday. “We still need to be worried about [Covid] but maybe not all the time.”