The province said it is encouraging people who are eligible to reach out to the pharmacy or primary care provider where they received the first dose to book an appointment for the second shot.
A total of 23,780,004 doses have arrived in the country since the beginning of the pandemic.
The addition of vaccines comes as Japan aims to finish inoculating the country's 36 million people age 65 and over by the end of July.
Malawi on Wednesday destroyed almost 17,000 doses of the AstraZeneca vaccine that had expired in mid-April, with the health minister blaming "propaganda" for many Malawians' reluctance to receive the jab.
Over 19-million people have received at least their first dose of the COVID-19 vaccine. When studied four to 13 days after the first vaccine dose, the effectiveness rose to 57%, and it rose to 91% after the second dose.
It was a different story in Manitoba, where record daily case counts and crushing pressure on the health-care system led Premier Brian Pallister to call on Prime Minister Justin Trudeau for help.
Public Health Ontario says the remaining inventory of AstraZeneca vaccines will be used as second doses.
A medical worker prepares a dose of COVID-19 vaccine at a drive-thru vaccination site in Toronto, Canada, on May 22, 2021.
Ohio governor offers chance at $1 million prize to get vaccinated
Now public health experts are looking for ways to convince people who are hesitant to get vaccinated against the deadly disease. The scholarship would include tuition, room and board, and books, DeWine said.
The changes come as Ontario reports 1,794 new cases of COVID-19 and 20 new virus-related deaths.
Quebec reported 752 new cases and nine more deaths, but none in the past 24 hours, while Saskatchewan had 173 cases and two deaths.
Dr. Marcia Anderson says more work must be done to get more Indigenous people booked for their first doses, too. Officials said new studies show the risk is low enough to go on.
Ontario is resuming use of the Oxford-AstraZeneca vaccine against COVID-19 but only as a second dose, as it rushes to use tens of thousands of shots before they expire on May 31. As a result, several provinces stopped using it more than a week ago pending further research.
In terms of blood clots, Dr. Grindrod mentioned the risk is about one in 60,000 for the first dose, but one in 600,000 for the second dose.
Prime Minister Justin Trudeau says Canada supports the Rome Declaration to fight COVID-19 globally.
- with files from AM800's Gord Bacon and The Canadian Press.