The head of the World Health Organisation has ruled out using herd immunity, to stop the spread of Covid-19.

 

It is the term to describe what happens when the population becomes immune through vaccination or mass infection.

 

For measles the herd immunity point is over 90 percent, while for polio it is at around 80 percent of the population.

 

Dr Tedros Adhanom says the strategy would be 'simply unethical.'

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