* High-mutation Covid-19 variant discovered in South Africa
* New Covid-variant fears take a bite out of global markets on Friday
* Flights from Europe, Asia to southern Africa suspended amid new Covid variant
* Money markets reverse rate-hike bets amid new coronavirus fears
* Beijing presses ride-sharing giant Didi to delist from US
* Fed prepared to hike rates if inflation stays hot, minutes show
* 10-year US Treasury yield pulls back sharply in early Friday trading: