According to a study by teams led by Zhong, two shots of Chinese inactivate vaccines showed 59 percent efficacy in preventing symptoms caused by the Delta variant during the outbreak in South China's Guangzhou in May and June.
After successfully building herd immunity, Chinese authorities can consider starting to provide boosters and the public can choose to accept boosters when available, Zhang said, noting that, in terms of booster shots, priority would also be given to some at-risk groups like people aged 60 and over, services and aviation industries employees. Studies in the United Arab Emirates showed that a third shot of CNBG's inactivated vaccines in six months after the second one would boost the level of antibodies in recipients by 5-10 times, which would also help to protect the recipients from mutations like Delta, Zhang noted.A booster dose of CoronaVac, a COVID-19 vaccine developed by another Chinese producer Sinovac, administered in the elderly eight months after the second dose can induce a significant increase in neutralizing antibodies, Sinovac announced previously.
According to a study by teams led by Zhong, two shots of Chinese inactivate vaccines showed 59 percent efficacy in preventing symptoms caused by the Delta variant during the outbreak in South China's Guangzhou in May and June.
After successfully building herd immunity, Chinese authorities can consider starting to provide boosters and the public can choose to accept boosters when available, Zhang said, noting that, in terms of booster shots, priority would also be given to some at-risk groups like people aged 60 and over, services and aviation industries employees. Studies in the United Arab Emirates showed that a third shot of CNBG's inactivated vaccines in six months after the second one would boost the level of antibodies in recipients by 5-10 times, which would also help to protect the recipients from mutations like Delta, Zhang noted.A booster dose of CoronaVac, a COVID-19 vaccine developed by another Chinese producer Sinovac, administered in the elderly eight months after the second dose can induce a significant increase in neutralizing antibodies, Sinovac announced previously.