Observational data on Sinopharm and Sinovac shots “clearly showed that in older age groups ... the vaccine performs less well after two doses”, the health body said.
source https://www.smh.com.au/world/south-america/who-advises-a-third-covid-shot-for-users-of-chinese-vaccines-20211012-p58z57.html?ref=rss&utm_medium=rss&utm_source=rss_feed
source https://www.smh.com.au/world/south-america/who-advises-a-third-covid-shot-for-users-of-chinese-vaccines-20211012-p58z57.html?ref=rss&utm_medium=rss&utm_source=rss_feed
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