First real-world data estimate Chinese vaccine is 50% effective in city where P.1 variant is widespread
- 49.6% real-world effectiveness for P.1 variant after only 1 shot. It’s also not clear how well the mRNA vaccines protect against the P.1 variant. The efficacy is based on assumption that P. 1 makes up most of the positive cases.
- “Probably the effectiveness will be higher than the preliminary study is showing,”， vaccine effectiveness in Brazil may produce artificially low results because there is a high risk that people have some immunity because of previous contact with the virus. 实际有效率可能更高因为实验的地方以前是传染重灾区，可能很多人以前接触过病毒本身已经有一定免疫
- The study’s preliminary results, not yet peer reviewed, were posted to a preprint server yesterday and are the first to assess the effectiveness of the vaccine made by Sinovac Biotech in an area flooded with the P.1 variant.