COVID-19 vaccine volunteers get second dose to determine validity

Ref: Global Times
  • China's earliest COVID-19 vaccine volunteers were offered a second dose on Sunday to strengthen their immunity after getting their first one in March, reported Global Times.

  • Volunteers will start a new one-year observation after the injection and their blood samples will be collected at least five times to measure their antibody levels, the news source said.

  • Part of China's first group of 108 volunteers started to get their second low-level dose of CanSino Biologics' Ad5-nCoV on a voluntary basis on Sunday, after they concluded their six-month follow-up period for the Phase I clinical trials, which began on March 17 in Wuhan.