An engineer shows an experimental vaccine for the COVID-19 coronavirus that was tested at the Quality Control Laboratory at the Sinovac Biotech facilities in Beijing (Getty Images)

Covid-19 roundup: Sino­vac pulls back from a promised PhI­II da­ta re­veal, rais­ing ques­tions about ef­fi­ca­cy

Af­ter promis­ing to re­veal the da­ta on a piv­otal tri­al for Sino­vac’s Covid-19 vac­cine in Brazil, the au­thor­i­ties in­volved hit the pause but­ton on the …

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