US & European sharemarkets tumbled on Friday on fears that that coronavirus mutation could be vaccine resistant. US President Joe Biden imposed fresh travel restrictions on nations in southern Africa. Travel-related stocks were hit hardest, although vaccine makers surged The Dow Jones index ended lower by 905 points or 2.5% – its worst day since October 28, 2020. And the S&P 500 index lost 2.3% – its biggest drop since February 25 – with the Nasdaq index down 354 points or 2.2%. Over the week the Dow fell 2%; the S&P 500 lost 2.2%; and the Nasdaq slid 3.5%.