Research team invites 80 to receive the third dose of Covid vaccineLocal | 3 Aug 2021 4:34 pm
A research team led by respiratory expert David Hui Shu-cheong will invite 80 people, who have received two doses of Sinovac vaccine, to receive the third dose of Covid-19 vaccine.
Hui, when speaking to media, said the Chinese University of Hong Kong invited 750 vaccinated citizens to participate in a research on the level of neutralizing antibodies developed after they completed vaccination this April.
Primary investigation suggested that at least 80 people saw the level of neutralizing antibodies developed in their bodies lower than expected a month after they completed Sinovac vaccination.
The research team will arrange 80 people to receive the third dose of Covid vaccine. They will randomly select half to get the BioNTech vaccine and the remaining half to get Sinovac vaccine.
The team will observe if there is any change in the level of antibodies developed in participants' bodies. They expected to collect preliminary data as soon as October.
The level of T-cells, a cell that reduces risk of developing adverse symptoms and death, for those who received Sinovac vaccine is similar to that for those who received BioNTech vaccine, the team also found out.
Hui said that those with lower level of antibodies are more likely to be infected, and more data are required to analyze the reasons behind the inadequate level of antibodies developed.
The data will then be submitted to the government for reference on arranging the mass public for receiving the third dose, he added.
Hui stressed that the public needs not to administer the third dose urgently.