FILE - In this Monday, March 9, 2020 file photo, Tedros Adhanom Ghebreyesus, Director General of the World Health Organization speaks during a news conference on updates regarding COVID-19, at the WHO headquarters in Geneva, Switzerland. The head of the World Health Organization warned against the idea that herd immunity might be a realistic strategy to stop the pandemic, dismissing such proposals as “unethical." At a press briefing on Monday, Oct. 12, 2020, WHO director-general Tedros Adhanom Ghebreyesus said health officials typically aim to achieve herd immunity _ where the entire population is protected from a virus when the majority are immune _ by vaccination. Tedros noted that to obtain herd immunity from measles, for example, about 95% of the population must be vaccinated. (Salvatore Di Nolfi/Keystone via AP, file)
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