![A Chinese Covid-19 vaccine has proved effective, its maker said.](https://cdn.newsserve.net/ONPglobe256.png)
A Chinese Covid-19 vaccine has proved effective, its maker said.
But state-run Butantan research institute is withholding results of trials at request of Chinese drug maker Sinovac
The U.A.E. said it reviewed an analysis by Sinopharm, a Chinese state-owned vaccine maker, of data from late-stage clinical trials...