Can Vaccination and Infection Rates Add Up to Reach COVID Herd Immunity?

Can Vaccination and Infection Rates Add Up to Reach COVID Herd Immunity?

First, do public health experts generally consider herd immunity to kick in at 60%? First, a review of herd immunity. For contagious diseases that have marked modern history — smallpox, polio, diphtheria or rubella — vaccines have been the mechanism through which herd immunity was achieved. “The concept of herd immunity means that once we reach the threshold, it’s going to go away,” Engel said. “It’s a witches’ brew of different factors to consider when you’re trying to estimate herd immunity at this point,” said Michaud.

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