Herd immunity doesn't make any one person immune, and outbreaks can still flare up. Nobody knows for sure what the herd immunity threshold is for the coronavirus, though many experts say it's 70 per cent or higher. HOW DO WE KNOW WE'VE REACHED HERD IMMUNITY? And those decisions are likely to begin long before the ideal herd immunity threshold is reached, though they will be gradual and vary by region. This is why the World Health Organisation has warned that global herd immunity is unlikely to be achieved this year.

Source: New Zealand Herald February 20, 2021 20:48 UTC