America is running out of people willing to get a COVID-19 shot, and some vaccination sites are even shutting down because of a lack of demand

The US may fall short of vaccinating enough people to stop coronavirus spreading in communities because not enough Americans are willing to get a COVID-19 shot, the Kaiser Family Foundation (KFF), a leading health nonprofit, warned Tuesday.

The nation's ample vaccine supply will outstrip "vaccine enthusiasm" within two to four weeks, the KFF said. Exact timing in each state could differ, it said.

Experts have estimated that about 70% of people need to be immunized to reach herd immunity, the threshold at which the virus can no longer easily spread. This could be difficult if Americans stop coming forward to get a COVID-19 shot, the KFF said.

Michael Fraser, the executive director of the Association of State and Territorial Health Officials, told The New York Times that some states felt they had already hit a wall. 

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