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China's two most widely used Covid-19 vaccines, developed by Sinovac and Sinopharm, were shown to be effective against the Delta variant of the coronavirus, according to a study based on real-world data in the country.
The two vaccines were 52 per cent effective against Delta infection and 60pc for symptomatic disease, researchers wrote in a peer-reviewed paper.
The study did not generate sufficient data to deliver effectiveness readings for the two vaccines separately or by age groups, researchers from a local disease control authority and two Chinese universities said in a paper published in the Annals of Internal Medicine.
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