Tennessee’s health departments and partners have plenty of infrastructure ready to deliver many more COVID vaccinations to an anxious public, Health Commissioner Dr. Lisa Piercey said in a conference call Friday. The problem is continued supply constraints from the federal government.“There are some really big levers we have that we can pull quickly, as in like a day or two, and those are those big mass vaccination sites that can be staffed,” Piercey said.On a day the Tennessee Department of Health (TDH) rolled out several changes to the state’s COVID-19 vaccination plan, Piercey repeatedly stressed the limitations to enactment of those changes until the state’s weekly supply increases.