30% effective in preventing deaths and hospitalizations, that's down from the 50% reporting earlier in the much smaller study. the advisory panel is scheduled to meet on tuesday to discuss whether to recommend the pill for fda authorization, mike? >> jonathan down in atlanta, thanks. wall street took a big tumble. the dow dropped 905, the s&p lost, for the week, dow lost 2%. the s&p 500 lost 2.15, the nasdaq lost. limiting travel from south africa and other countries. white house correspondent jackie line richt is with the president on nantucket tonight. good evening, jackie. >> good evening, mike. only hours after anthony fauci said u.s. officials were seeking information from the south