U.S. says China backed hackers who targeted COVID-19 vaccine research
The indictment said that the hackers operated both for their own profit and also for the main Chinese intelligence service, the Ministry of State Security.
July 21, 2020

https://www.nbcnews.com/politics/justice....

**** emphasis is mine:

Does it matter that Chinas Sinovac COVID vaccine is only 50% effective?
JAN 13, 2021

https://allianceforscience.cornell.edu/b....

Researchers at Brazils Butantan Institute in Sao Paolo have announced that trials of the CoronaVac vaccine made by the Chinese company Sinovac show it is just over 50 percent effective overall, once very mild cases of the disease are taken into account, which is barely over the threshold needed for regulatory approval.

How does this actually compare with the results for the other vaccines, e.g., the Pfizer-BioNTech and Oxford Astra-Zeneca vaccines?

Well, again on face value its not as good. But remember, these vaccines all use different platforms. ****The Chinese vaccine is an inactivated virus, basically a killed COVID virus****, while the Pfizer vaccine uses mRNA and the Oxford/AstraZeneca uses a viral vector. The inactivated virus approach has been used for decades against many different diseases, so it is very well proven in the real world, but it maybe slightly weaker than the newer approaches.