Covid vaccine: Dr Hilary says 'you can't rely' on vaccines to provide herd immunity

“Both viral evolution and changes in how people interact with each other can bring this number up or down,” it elaborated.

However, the higher the level of immunity in the population, the larger the benefit.

“This is why it is important to get as many people as possible vaccinated,” it said.

Population-based studies cited by the organisation demonstrated that an initial Covid infection is protective against repeat infection for more than six months.


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