We do not yet know the precise threshold of vaccinated people in the community needed to stop the spread of COVID-19 and achieve herd immunity. For flu, experts say the figure is around 70%, so that is the current working theory for COVID-19. Further research and modelling are needed to get a more concrete value. The recent emergence of COVID-19 strains with a higher transmission rate might require more of us to get vaccinated to achieve community protection. Epidemiology experts are monitoring the situation.
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