IOWA CITY — University of Iowa Health Care vaccinated nearly 1,000 Johnson County residents aged 65 and older Wednesday, among the first members of the community to receive the COVID-19 shot as the health care system moves its vaccination effort beyond front line health care workers to focus on the broader general public.The Iowa City-based health system used up all doses it was allocated this week for the large-scale vaccination effort, an indication to UIHC officials that the event Wednesday was a successful test run of mass clinics they hope to establish throughout Johnson County and beyond.“We really do have the ability to safely deliver this to a broad part of the community in a really fast and effective way,” CEO Suresh Gunasekaran told reporters Wednesday.