How are the Vaccine success rates calculated?
Is it simply a matter of giving say 1000 people the vaccine and then seeing how many of them contract Covid in the next n weeks/months?
Those people will carry on using masks, washing hands and social distancing. What is to say the success of the vaccine is not dowm to those factors?
I guess they are comparing the figures against another sample group that has had a placebo.
Are there any results from testing where the vaccinated group were subsequently deliberately infected with the virus? I know this option was mooted several months ago as being the most accurate way of determining efficacy.