coronavirus March 1, 2021 8:46 am CDC Director ‘Worried' About Rolling Back COVID-19 Restrictions Director of the Centers for Disease Control and Prevention Rochelle Walensky says she is concerned about the leveling off in recent declines of COVID-19 cases across the country. US & World Videos 4:02 Updated COVID vaccines coming 3:17 Slight summer uptick of COVID cases in California 3:57 Interview: Doctor's perspective on COVID 4 years after shutdown started 2:09 CDC updates COVID isolation guidelines 1:37 Study examines effectiveness of main COVID treatment Paxlovid