Americans must recommit to wearing masks and taking other Covid-19 mitigation measures to avoid a new surge of the virus in the U.S., a top health official said Monday as the White House signaled that shipments of Johnson & Johnson’s vaccine could fall just short of an early target. Rochelle Walensky, director of the Centers for Disease Control and Prevention, said cases have begun to rise slightly again, while hospital admissions remain stable and deaths continue to decline. Variants, which are in some cases more contagious or more dangerous, continue to spread, she said. “Taken together, these statistics should serve as a warning sign for the American people,” she said at a press briefing. “We must act now and I am worried that if we don’t take the right actions now, we will have another avoidable surge” as is being seen in Europe. Walensky repeated a warning that states are lifting restrictions too early, and called on Americans to continue to wear masks, avoid crowds and wait to travel, even if they’ve been vaccinated. “I’m calling the American people to action, whether vaccinated or not, to recommit to doing the right thing -- take the steps we know work to stop Covid-19,” she said. Subscribe to our YouTube channel: https://bit.ly/2TwO8Gm Bloomberg Quicktake brings you live global news and original shows spanning business, technology, politics and culture. Make sense of the stories changing your business and your world. To watch complete coverage on Bloomberg Quicktake 24/7, visit http://www.bloomberg.com/qt/live, or watch on Apple TV, Roku, Samsung Smart TV, Fire TV and Android TV on the Bloomberg app. Have a story to tell? Fill out this survey for a chance to have it featured on Bloomberg Quicktake: https://cor.us/surveys/27AF30 Connect with us on… YouTube: https://www.youtube.com/user/Bloomberg Breaking News on YouTube: https://www.youtube.com/c/BloombergQuickTakeNews Twitter: https://twitter.com/quicktake Facebook: https://www.facebook.com/quicktake Instagram: https://www.instagram.com/quicktake