Covid-19: Can herd immunity ever be a viable strategy?

Questions are growing over whether we can reach the critical threshold needed to protect the vulnerable, given the delays to the vaccine rollout and the dangers of the Delta variant

6th June, 2021
Covid-19: Can herd immunity ever be a viable strategy?
Crowds gather on South William Street in Dublin city centre: ‘Relying on herd immunity alone is not going to work. New variants could pop up any day’. Picture:

The concept of herd immunity has become the promised land of the pandemic. “Herd immunity is when enough people are vaccinated that there’s nowhere for the virus to spread,” said Kingston Mills, a professor of experimental immunology at Trinity College Dublin.

As a result of mass vaccination, cases fall to zero naturally and any new infections introduced to the country then die out on their own. Ultimately, it is the key...

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