Sinovac's Vaccine Found Inferior to Pfizer Shot in Chile Study

Sinovac’s vaccine was less potent than Pfizer’s at stopping Covid-19 in Chile where the two shots were used simultaneously, allowing the first real-world comparison of the two inoculations. China’s CoronaVac was 66% effective in preventing Covid among fully vaccinated adults, compared with 93% or the jab made by Pfizer and its partner BioNTech. The research shows both shots protect against severe disease. Sinovac’s inactivated inoculation, given to more than 10 million Chileans, was slightly less effective in preventing hospitalization and deaths than Pfizer’s messenger RNA vaccine, which was administered to fewer than half a million people, according to the study, published in the New England Journal of Medicine.