Published Tuesday, July 6, 2021 1:39PM EDT Last Updated Tuesday, July 6, 2021 6:38PM EDT More than 200 people are being contacted to repeat their COVID-19 vaccinations because some who attended an immunization clinic in the Niagara region were injected with a saline solution instead of the shot. Niagara Region Public Health said Tuesday that six people were injected with the harmless saline substance on June 16 at a clinic in Port Colborne, Ont. An end-of-day audit found six administered doses had not been accounted for and an additional vial of a saline diluent had been used. The diluent is meant to be mixed with the Pfizer-BioNTech vaccine concentrate and while not harmful, it doesn't protect against COVID-19.