The vaccines, which have not completed Phase 3 trials, were developed by the state-owned China National Biotec Group Corporation, known as Sinopharm.
In a statement posted on Sinopharm's website this month, the company said its two vaccine candidates had been administered "hundreds of thousands of times" under the emergency use program approved by the government.
The vaccines were used on medical professionals, diplomats deployed to high-risk countries, and state-owned company employees working overseas under China's Belt and Road Initiative, according to the firm's general counsel Zhou Song.
"There was not a single case that demonstrated significant negative effects, nor was anyone infected," Zhou said in the statement.
