coronavirus October 15, 2020 2:45 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 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 0:52 Lifeguard shortage impacts LA County pool hours 2:17 LA County: Mask Mandate Could Return in Weeks 2:22 Avoiding a COVID Winter Surge