The efficacyof a vaccine is its ability to decrease the incidence of that disease in a set population. The *incidence *is the probability that an individual will be diagnosed with a disease over a certain period of time. Efficacy and effectiveness mean two different things when it comes to vaccines, but in this case 95% is efficacy
The incidence of covid is tricky to determine for a number of reasons but lets pretend that its 10% across a certain time period. They determined the covid vaccine to have 95% efficacy after two doses. In this scenario it reduces each persons chance of being diagnosed with the disease by 95% across that time period, from 10% to 0.5%. This is just theoretical because in reality there are always people who are unable to take a vaccine and other variables.
95% efficacy does not mean that if a person contracts the disease they are 95% less likely to die of it.
The efficacyof a vaccine is its ability to decrease the incidence of that disease in a set population. The *incidence *is the probability that an individual will be diagnosed with a disease over a certain period of time. Efficacy and effectiveness mean two different things when it comes to vaccines, but in this case 95% is efficacy
The incidence of covid is tricky to determine for a number of reasons but lets pretend that its 10% across a certain time period. They determined the covid vaccine to have 95% efficacy after two doses. In this scenario it reduces each persons chance of being diagnosed with the disease by 95% across that time period, from 10% to 0.5%. This is just theoretical because in reality there are always people who are unable to take a vaccine and other variables.
95% efficacy does not mean that if a person contracts the disease they are 95% less likely to die of it.