China's Evergrande crisis could drag down Tether and other cryptocurrencies: CNBC After Hours

CNBC.com's MacKenzie Sigalos brings you the day's top business news headlines. On today's show, CNBC's Kate Rooney explains why Chinese property developer Evergrande Group's debt crisis could be trouble for Tether. Plus, Johnson & Johnson finds a second shot of its Covid vaccine to be 94% effective against infection.