Sinovac wasn't great against the original strain, but against Omicron, Sinovac is basically worthless. A two-dose regimen provides literally no benefit, and three doses is only equivalent to unboosted, two-dose mRNA (aka, not really effective): https://news.yale.edu/2022/01/20/vaccine-used-much-world-no-...
Sinovac is trash, but politically China can't admit failure and buy the Western vaccines, and hence it's stuck with lockdowns.
Sinovac wasn't great against the original strain, but against Omicron, Sinovac is basically worthless. A two-dose regimen provides literally no benefit, and three doses is only equivalent to unboosted, two-dose mRNA (aka, not really effective): https://news.yale.edu/2022/01/20/vaccine-used-much-world-no-...
Sinovac is trash, but politically China can't admit failure and buy the Western vaccines, and hence it's stuck with lockdowns.