We can see from Tables 9 and 10 that when the effectiveness is 99%, then
between 90.9-92.6% of the population need to be vaccinated in order for . When
the effectiveness is 87%, then between 103.4%-105.4% of the population need to be
vaccinated in order for . However, it is not possible to vaccinate over 100% of the
population. Therefore when the vaccination is 87% effective the researcher’s and health
officials are unable to meet their goal of having .
We can calculate what the effectiveness needs to be for various vaccination
coverage percentages and still have . This is shown on the following table.