Source: China – South China Morning PostChina is preparing to test blood samples from the period before its Covid-19 outbreak for evidence of infection, health authorities said on Thursday, a process which could uncover earlier cases of the disease.The research will be conducted in Wuhan, where Covid-19 was first identified in late 2019, and can only take place once a two-year statutory blood storage period has passed, according to scientist Liang Wannian, who led Chinese experts during a WHO-backed inquiry into the origins of the…Read More