Now that vaccines for covid-19 are on the horizon, the next challenge will be to get enough people to take it. It seems that roughly 60% is the minimum number of people who should have immunity to the disease for herd immunity to take effect. Since the vaccines are about 90% effective, that means about 70% of the population needs to get it to achieve herd immunity. But getting to that number is not going to be easy. Surveys suggest that for various reasons, about 30% of Americans are what is called ‘vaccine hesitant’ and likely will not take it. That means that we will barely make the required threshold even if everyone who is not opposed to vaccines gets it. The 30% is greater than the hardcore anti-vaxxers who oppose giving vaccines to their children.
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