Xinhua | Updated: 2021-05-19 09:11 Share CLOSE Marcie Meek, 88, poses for a photo with a sign referring to herd immunity after receiving the coronavirus disease (COVID-19) vaccine at the Brightwater Senior Living community in Highland, California, US, January 22, 2021. [Photo/Agencies] WASHINGTON -- The end of this pandemic sometimes gets boiled down to two words: herd immunity. But now, as an academic debate swirls over when or even if America can get to a high enough percentage of people with immunity to reach that goal, some scientists say it's time for the public to stop worrying about it, National Public Radio (NPR) reported on Tuesday.