A pharmacist administers a dose of the COVID-19 vaccine to a worker at a processing plant in Arkansas City, Kan., on Friday, March 5, 2021. Researchers are concerned that vaccination rates in some rural communities may not keep up with urban rates.

A Graves Drug pharmacist administers a dose of the Covid-19 vaccine to a worker at the Creekstone Farms Premium Beef LLC processing plant in Arkansas City, Kansas, U.S., on Friday, March 5, 2021. Independent pharmacy owners in the U.S. are often the sole providers of the Covid vaccine in rural or exurban communities. But a majority of independent owners are still waiting for supply. (Doug Barrett/Bloomberg via Getty Images)