Answer to Question #175383 in Evolution for Sydney

Question

The B.1.1.7 SARS-Cov-2 variant has been measured as having an R₀ of 1.1. If the generation time for COVID is 3 days in unvaccinated persons, how many people will be infected starting with an initial cohort of 1 infected individual in one month? *Hint this calculation assumes that unvaccinated people are following the 3Ws.

Answer 1

The percentage of people who need to be immune in order to achieve herd immunity varies with each disease. For example, herd immunity against measles requires about 95% of a population to be vaccinated. The remaining 5% will be protected by the fact that measles will not spread among those who are vaccinated.