October 6, 2021 1:09 pm Yale Study Looks at Natural COVID-19 Immunity A new Yale study shows those who get COVID-19 may not be protected by natural immunity for a long period of time. US & World Videos 2:39 Nighttime forecast for Sept. 7 1:12 Forecast for Sept. 7 1:17 Morning forecast for Sept. 7 0:47 Overnight forecast for Sept. 7 2:27 Nighttime forecast for Sept. 6