China has not yet approved mixing doses of different vaccines using different technologies, but the director of the Chinese Center for Disease Control and Prevention said in April the country was considering it as a way of boosting vaccine efficacy.
Five out of the seven vaccines used in China’s inoculation campaign are inactivated, meaning they use a coronavirus that cannot replicate in human cells. These include the Sinovac shot and two vaccines from Sinopharm.
A total of 300 healthy adults aged 18-59 years will be recruited for the trial.
Some participants who have received either one or two doses of inactivated vaccine…