June 12, 2020 Dr Maria Exall COVID-19 Blog COVID-19 and the survival of the fittest (COVID-19 blog no. 7) June 12, 2020 Dr Maria Exall COVID-19 Blog An early Government slogan summarising their strategy for the outbreak of the COVID-19 pandemic was ‘herd immunity’. Whether this is a useful phrase for epidemiologists or not, the decision to use it by politicians is political.