China has very few cases of the disease so the trials can only happen elsewhere in the world. Overall, the effect is good and Chile is going forward with it.
Studies of vaccinated populations in Chile and Brazil show Sinovac can reduce deaths, counter variants
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China vaccines put to real-world test against Covid-19
- Studies of vaccinated populations in Chile and Brazil show Sinovac can reduce deaths, counter variants
- Efficacy rates are lower than mRNA shots but experts say that means more people will need to receive vaccinations to achieve herd immunity
a study of 10.5 million people in Chile found the Sinovac vaccine was 67 per cent effective in preventing symptomatic Covid-19, and 80 per cent effective in preventing deaths – meaning that 100 fatal cases of the disease would have been reduced to just 20 if everyone was vaccinated. The researchers also found the vaccine was around 85 per cent effective at preventing hospitalisations.
The results were not far off those from a phase 3 clinical trial in Brazil, which found the vaccine was around 50 per cent effective and returned a similar figure to Chile’s real-world study for the prevention of moderate and severe cases of the disease. In contrast, a Turkish clinical trial found an 83.5 per cent rate of effectiveness, a result which could underline the importance of local circumstances. "
Also 26% of Chile is vaccinated with mainly Chinese Sinovac versus over 50% of the US with mainly Moderna and Pfizer.
The per million infected rate in US is 98,051 vs just 59,300 in Chile.