China / Science
Coronavirus: Brazil finds China’s Sinovac vaccine to be less effective than previous data shows
The new rate is a result of patients who displayed ‘very light’ symptoms being included, says Brazilian research institute that conducted the clinical trials
New CoronaVac ‘general efficacy’ figure from the Butantan biomedical centre comes after pressure for more transparency amid piecemeal disclosure and delays
Eduardo Baptista in Lisbon Published: 1:21am, 13 Jan, 2021
www.scmp.com/news/china/science/article/...nt-efficacy-chinas
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Phase 3 trial data for the US-based Pfizer-BioNTech Covid-19 vaccine
, for example, gives a 95 per cent efficacy rate. However, out of the 44,000 volunteers there were 3,410 participants who displayed Covid-19 symptoms but were not tested, according to a US Food and Drug Administration report. In the unlikely event that all these participants tested positive, the total efficacy rate would drop to below 30 per cent.
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