The AstraZeneca vaccine attracted a lot more attention for its side effects after some people developed after vaccination.
The Sinovac vaccine uses more traditional vaccine technology, relying on inactivated virus particles to produce an immune response.
It has demonstrated high clinical efficacy against the Alpha and Beta variants as well.
Neither of these has been approved for regular or emergency use in the United States yet.
We have now learned that have also passed their Phase 3 clinical trials,.
More than a dozen European countries have halted the distribution of the AstraZeneca-Oxford vaccine as a result.