80% of S'pore's population needs to be vaccinated to achieve herd immunity: Chief health scientistDec 18, 2020 | 🚀 Fathership
"Where most of a population have immunity to the virus, this "herd immunity" indirectly reduces the risk of infection for those who are not immune to it, thereby limiting infection clusters," he said on Wednesday.
"The estimates for herd immunity vary generally around 60 to 70 per cent of the population, but a vaccine coverage of at least 80 per cent would be prudent."
Assuming the efficacy of a Covid-19 vaccine is 90 per cent, vaccinating 80 per cent of the population would mean that about 72 per cent of the population would become protected, he explained.
Achieving herd immunity against Covid-19 helps protect those who cannot be vaccinated because of their age or their medical conditions.