
A double dose of China’s CoronaVac vaccine is 83.5% effective against symptomatic COVID-19, researchers say. Their phase 3 trial included more than 10,000 people, aged 18 to 59, in Turkey who received either two doses of CoronaVac 14 days apart or an inactive placebo. An immune response analysis of 981 participants who got the vaccine… read on > read on >