It was not until around 2010 that we decided in the US to vaccinate everyone. It was highly debated that everyone in hospitals had to get a vaccine. The option in some states was to allow the use of masks. That is why before 2020 I could find no study that masks generally do not work as a substitute for a vaccine.
The unintended consequences of this is we now are seeing the efficacy of vaccines drop when taken year over year and we don't know why. In general a vaccine is 20% to 60% effective. In 2017-2018 season it was 36%
It was not until around 2010 that we decided in the US to vaccinate everyone. It was highly debated that everyone in hospitals had to get a vaccine. The option in some states was to allow the use of masks. That is why before 2020 I could find no study that masks generally do not work as a substitute for a vaccine.
The unintended consequences of this is we now are seeing the efficacy of vaccines drop when taken year over year and we don't know why. In general a vaccine is 20% to 60% effective. In 2017-2018 season it was 36%