SANTIAGO: China's Sinovac Covid-19 vaccine was 67% effective in preventing symptomatic infection, data from a huge real-world study in Chile has shown, a potential boost for the jab which has come under scrutiny over its level of protection against the virus.

The CoronaVac vaccine was 85% effective in preventing hospitalisations and 80% effective in preventing deaths, the Chilean government said in a report, adding that the data should prove a "game changer" from the vaccine more widely.