TAIPEI—Pressure is mounting on Chinese drugmakers to show clinical evidence that their leading Covid-19 vaccines work, after early data on three Western-developed shots showed promising effectiveness against the disease.
Earlier this week, AstraZeneca PLC and the University of Oxford said their vaccine candidate was anywhere between 62% to 90% effective, joining two other Western vaccine rivals in providing data. The results could allow the U.S. and other countries to grant regulatory authorization and gear up distribution…
