Rochelle Walensky, who played a key role in Covid response, resigns as CDC chief

Her departure comes as emergency declarations come to an end: I have never been prouder of anything I've done'

Rochelle Walensky, who played a key role in the Biden administration's response to the Covid-19 pandemic, announced she will step down as the director of the Centers for Disease Control and Prevention.

The announcement came as the World Health Organization said Friday that Covid is no longer a global emergency. The waning of the pandemic was a good time to make a transition, Walensky said.