Coronavirus October 15, 2020 5:45 pm Doctors Push Back Against ‘Herd Immunity' as COVID-19 Cases Spike As COVID-19 cases increase in 36 states, medical experts are pushing back against the White House’s embrace of a “herd immunity” strategy. US & World Videos 1:39 Lawrence police cracking down on illegal dirt bikes 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 2:30 Putting an increase in COVID cases into context 1:41 COVID cluster prompts masking at Beth Israel Deaconess Medical Center 0:50 COVID cluster at hospital prompts return of mask requirement in affected unit