Warning: Missing argument 3 for write(), called in /www/wwwroot/biwei1.cn/incs/robot.php on line 68 and defined in /www/wwwroot/biwei1.cn/incs/data.php on line 487 White House doctor Kevin O'Connor says that President Biden's COVID-19 symptoms have 'improved meaningfully' after doses of the antiviral medication Paxlovid.