Article content We apologize, but this video has failed to load. Try refreshing your browser. Grey-Bruce sets record for largest vaccine clinic Back to video Grey Bruce Health Unit administered 3,498 vaccines at the Hockey Hub mass immunization system in Hanover on Wednesday, April 7. To the Health Unit’s knowledge, this is the largest volume single-day mass immunization event in Canada. On average, the Hockey Hub mass immunization system vaccinated 350 people per hour. Clinic staffing included five vaccinators working at all times (including one volunteer physician), serving five rows of 30 pods each, total 150 vaccine pods. An additional 10 staff were reconstituting vaccine, mixing and drawing into syringes. There were eight registration desks and 20 volunteers inside (three four-hour shifts), 10 town volunteers coordinating parking outdoors and four Grey County EMS volunteers assisted in both clinical and non-clinical capacities.