LISA SCHENCKER Chicago Tribune The first official week of COVID-19 vaccinations for seniors and essential workers in Illinois has sparked mixed emotions and many questions about the process of getting vaccinated. The vast majority of Illinois seniors and front-line essential workers who are eligible for vaccinations under the phase that started Monday have not yet received shots. Supply remains extremely limited. But some of those who did get vaccinated reported problems scheduling a second shot. Others worried that a blizzard would keep them from their appointments. Many of those who have yet to be vaccinated are wondering why their health systems havenât yet invited them to be inoculated.