SEMINOLE COUNTY, Fla. – Serenity Towers in Sanford was transformed into a coronavirus vaccination site Tuesday morning, with the introduction of its mobile unit.The Department of Health in Seminole County partnered with county officials and Sanford Fire paramedics to bring their mobile unit into the senior community, expanding the county’s vaccine program to those most vulnerable to COVID-19.“We started mobile delivery today to individuals that are transportation disadvantaged and seniors,” said Alan Harris, Seminole County’s Emergency Director. “Some have a hard time getting around, have a hard time getting on 417 and driving to the Oviedo Mall.