Sharjah24 - Reuters: 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, a study based on real-world data in the country showed.
The two vaccines were 52% effective against Delta infection and 60% 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.
The data is based on an analysis of more than 100 infections and more than 10,000 of their close contacts during a Delta outbreak in the southern Chinese province of Guangdong in May and June last year.
They were also 78% effective for pneumonia, and 100% for severe or critical COVID-19.
Among those fully vaccinated participants, only six individuals were aged 60 years or older, said the authors.
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