Herd immunity is usually achieved with a vaccine, take polio as an example. But in the fight against the coronavirus, some countries argued about the option of a natural herd immunity. Some experts want to allow the infection to spread,…
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Herd immunity is usually achieved with a vaccine, take polio as an example. But in the fight against the coronavirus, some countries argued about the option of a natural herd immunity. Some experts want to allow the infection to spread,…