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 on Tuesday.
A vial labelled "Sinovac COVID-19 Vaccine" is seen in this illustration taken January 16, 2022. REUTERS/Dado Ruvicand Sinopharm, were shown to be effective against the Delta variant of the coronavirus, a study based on real-world data in the country showed on Tuesday.
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.
Kim said the readings may be affected by potential differences between vaccinated and unvaccinated subjects and varied exposure risk to the virus because real-world data are generally not as clean as those from clinical trials.
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