Amazon is launching on-site vaccination clinics at warehouses across three states, the company announced Thursday.

The first clinic is opening Thursday at a warehouse in Missouri and more clinics will open at facilities in Nevada and Kansas in the coming weeks. At the clinics, which are expected to run for about five days, vaccines will be administered to employees by licensed health-care providers.

Amazon expects to launch clinics at additional warehouses in the U.S. as more vaccine supply becomes available to front-line employees in other states. Some of Amazon’s frontline workers have already been vaccinated in states where they’re eligible.

The move comes as the U.S. continues to pick up the pace of vaccinations, with the nation administering more than 2.5 million shots per day.