We found that vaccines continue to provide significant protection against symptomatic infection with the Delta variant—all surpassed the 50% threshold recommended by WHO
The Economist
has collected what is possibly the largest set of vaccine results against the Delta variant, in terms of hospitalisation and symptomatic infection.
We found that vaccines continue to provide significant protection against symptomatic infection with the Delta variant—all surpassed the 50% minimum threshold recommended by the World Health Organisation. And they provided even better protection against hospitalisation. But some results are more impressive than others.
Take hospitalisations first. In stage-three trials, a vaccine made by Sichuan Clover Biopharmaceuticals, a Chinese firm, and Covaxin both eliminated hospitalisations among the vaccinated altogether, although the small number of hospitalisations in the control groups makes efficacy estimates uncertain for the former and impossible for the latter. Data from a trial in St Petersburg suggests an effectiveness of 68-88% for the two-dose regimen of Sputnik V.
, Moderna and Pfizer-BioNtech, performed best. They are followed by AstraZeneca, which in a trial in Canada was 69-95% effective . Chinese and Indian shots are not as impressive. In a very small real-world trial in Guangzhou, a city in southern China, data from recipients of two shots of vaccines made by either Sinopharm or Sinovac indicated an effectiveness of 16-82% . Clover’s product had an efficacy against Delta of 57-90% in its phase-three trials.
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