Is it difficult to maintain collective immunity

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3 percent of them say they are undecided. This shows that 3 in 10 adults worldwide refuse to be vaccinated, which corresponds to 1.3 billion people. Experts say that 70 to 85 percent of the total population should be vaccinated for herd immunity, while those who do not want to be vaccinated pose a great threat and a danger to herd immunity.

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