FILE - In this Dec. 23, 2020, file photo, a nurse administers the first of the two Pfizer-BioNTech COVID-19 vaccinations in Chicago. Governors and health officials have been reluctant to sign on to a Biden administration plan to open 100 federally supported vaccination sites by the end of February. With vaccine supplies running tight, they want assurances that the doses will come from a separate federal supply and not their own. (AP Photo/Charles Rex Arbogast, File)

The Illinois Department of Public Health says over 50-percent of adults in the state have received at least one COVID-19 vaccine dose. IDPH also says 50-percent of 16-year-olds have received at least the first vaccine dose. More than eight-point-one-million doses have been administered in the state since the vaccination effort began.