text: How do the Chinese vaccines compare to other approved jabs? CoronaVac, made by Chinese pharma company Sinovac, was found to be just 3 per cent effective at stopping symptomatic illness after the first dose, rising to 56.5 per cent two weeks after the second. Another Chinese-made vaccine made by state-owned pharmaceutical firm Sinopharm appears slightly better than the CoronaVac, 73 per cent efficacy against symptomatic illness