New results on the Chinese vaccine

Importantly, this was the first study of an inactivated SARS-CoV-2 vaccine to include participants older than 60 years—the most vulnerable age group for this infection. In the phase 1 dose-escalating trial, the vaccine was given at a two-dose schedule at three different concentrations (2 μg, 4 μg, and 8 μg per dose) and was well tolerated in both age groups (18–59 years and ≥60 years). The older age group had lower rates of solicited adverse events than the younger adults: the overall rates of adverse events within 28 days after vaccination were 34 (47%) of 72 participants in the group aged 18–59 years, compared with 14 (19%) of 72 participants in the group aged 60 years and older. At the same time, in both age groups the vaccine was similarly immunogenic: the geometric mean anti-SARS-CoV-2 neutralising antibody titres measured by a 50% virus neutralisation assay 14 days after the booster dose were 88, 211, and 229 in the group aged 18–59 years and 81, 132, and 171 in the group aged 60 years and older for 2 μg, 4 μg, and 8 μg vaccine doses, respectively. Moreover, the authors tested cross-reactivity of the neutralising antibodies against several drifted SARS-CoV-2 isolates and showed the potential of their vaccine to protect against evolutionary diverged viruses, should they appear in circulation.

And:

The current study is the second to report the interim results of safety and immunogenicity of inactivated SARS-CoV-2 vaccine, with the first being the another β-propiolactone inactivated aluminium-adjuvanted whole-virion SARS-CoV-2 vaccine developed by Wuhan Institute of Biological Products.

Both studies showed very similar

Keep reading this article on Marginal Revolution.

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