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Chinese mRNA Shot Beat Sinovac as Booster But Caused More Fevers

The mRNA Covid-19 vaccine, developed by Chinese vaccine maker Walvax Biotechnology.
The mRNA Covid-19 vaccine, developed by Chinese vaccine maker Walvax Biotechnology.Photographer: Jiang Qiming/China News Service/Getty Images
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China’s home grown mRNA vaccine stimulated the production of more protective antibodies than an inactivated shot when given as a booster, though it appeared to cause more side effects, according to study released Tuesday.

The mRNA vaccine, co-developed by Walvax Biotechnology Co., Suzhou Abogen Biosciences Co. and the Chinese military, generated antibodies against the delta variant at levels that were 6.5 times higher than those induced by the inactivated vaccine from Sinovac Biotech Ltd, research posted on the medRxiv website found. The immunizations were given as a third shot to 300 previously vaccinated people in the trial, which has yet to be peer-reviewed.