How the Dakotas are successfully rolling out COVID vaccines — and 2 major lessons for larger states Patricia Kelly Yeo At a mass vaccination site set up in a California Six Flags, a nurse administers the COVID vaccine. North Dakota and South Dakota are two of the states doing the best job at distributing coronavirus vaccines. Despite an uneven nationwide rollout, they have excelled due to centralised storage and vaccination sites. Flexibility and collaboration between health systems has been key to getting approximately 80% of delivered vaccines into arms. North Dakota and South Dakota are among the US states doing the best job of rolling out coronavirus vaccines, and their experience could provide valuable lessons as the rest of the country struggles to catch up.