From the study I posted earlier, I had misread this statement…
The overall infection rate during the nationwide COVID-19 pandemic that followed the Chinese government’s “New ten measures” policy issued on 7 December 2022 (21) was estimated at 87.54%
They are admitting that there is an overall infection rate near 90% and prior vaccine efforts have failed.
Second, because blank controls (i.e., participants who do not receive a fourth vaccination dose) were not recruited into the study, we could not assess the efficacy of a four-dose immunization regimen against breakthrough infection with SARS-CoV-2. Therefore, the protective effect of the second heterologous booster vaccination regimen remains uncertain
Interesting…
But
By following participants who received a fourth-dose vaccination with Ad5-nCoV or the inactivated SARS-CoV-2 vaccine, we observed that 78.01% (149/191) of participants were infected or suspected to be infected with SARS-CoV-2. The breakthrough infection peak occurred between 20 December 2022 and 26 December 2022, consistent with the nationwide peak on 22 December 2022….66.49% (127/191) of participants developed symptoms and had positive nucleic acid or antigen test results