U.S. to run out of enthusiastic vaccine-takers in 2-4 weeks

U.S. to run out of enthusiastic vaccine-takers in 2-4 weeks

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Between the lines: Vaccine hesitancy is rapidly approaching as our main impediment to herd immunity.

"It appears we are quite close to the tipping point where demand for rather than supply of vaccines is our primary challenge," the authors write.

"Federal, state, and local officials, and the private sector, will face the challenge of having to figure out how to increase willingness to get vaccinated among those still on the fence, and ideally among the one-fifth of adults who have consistently said they would not get vaccinated or would do so only if required."