Why is the US investigating the origins of the coronavirus?

US President Joe Biden’s administration is expected to announce the results of a three-month investigation into the origins of the coronavirus pandemic as soon as this week, potentially aggravating US-China friction as health authorities globally struggle to subdue the ever-evolving contagion.Why was the investigation ordered?The move grew out of frustration over restrictions placed on a probe conducted by Chinese and international scientists, organised by the World Health Organization (WHO),…