Among more than 90 countries that are using Covid-19 vaccines from China, several countries have seen new Covid-19 outbreaks. Examples from these countries suggest that the Chinese vaccines may not be very effective at preventing the spread of the virus, but experts say they're not a total failure. CNN's David Culver has more.


원문출처 : https://www.cnn.com/videos/world/2021/06/25/china-vaccine-sinovac-sinopharm-coronavirus-covid-19-efficacy-culver-pkg-intl-hnk-vpx.cnn