Ontario's COVID-19 task force head asks Health Canada to 'look into' single-dose Moderna vaccine The head of Ontario's COVID-19 vaccine task force is calling on Health Canada to "look into" the possibility of providing Moderna's vaccine as a single dose, rather than two, in a bid to quickly expand capacity as cases of the illness surge in the province. Social Sharing CBC News · Posted: Dec 29, 2020 8:37 AM ET | Last Updated: December 30, 2020 Ontario's COVID-19 vaccination task force says it hopes to immunize up to 8.5 million people by the end of July, 2021.(Evan Mitsui/CBC)