"A large phase 3 trial in Brazil showed that two doses, administered at an interval of 14 days, had an efficacy of 51% against symptomatic SARS-CoV-2 infection, 100% against severe COVID-19, and 100% against hospitalization starting 14 days after receiving the second dose."
Extract source:
https://www.who.int/news-room/feature-stories/detail/the-sinovac-covid-19-vaccine-what-you-need-to-know
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Most vaccines are not designed to prevent infection but are designed to prevent serious symptoms. Research is still underway regarding whether the Coronavirus vaccines prevent infection:
https://www.nature.com/articles/d41586-021-00450-z