This will be followed by individuals who received their first dose between March 8 and April 18.
Officials say they expect to start allowing people between the ages of 12 and 25 to book their second doses at the beginning of August.
The government has said it will administer Pfizer as a second dose, but also has suggested those who want AstraZeneca for their second shot will be given that drug. The province said it may also include other groups around that time, such as individuals with highest health risk conditions and special education workers.
The Japanese government is considering sharing with Taiwan some of its supply of the COVID-19 vaccine developed by Britain's AstraZeneca Plc, Foreign Minister Toshimitsu Motegi said Friday, in a bid to help the self-ruled island struggling to procure shots. Most residents are now waiting about four months between each dose, with some exceptions for those in long-term care, high-risk health-care workers and people with specific health conditions. This means older children could be fully vaccinated prior to returning to school in September.
Officials announced that the dose interval has been amended from four months to as short as 28 days, depending on supply, which has been steadily shipping into the country over the past few weeks. As of Thursday, only about 1 percent of Taiwan's population had received a first shot.
Ontario is scrambling to use some 45,000 AstraZeneca shots by the end of May, with another 10,000 set to expire in June.
The AstraZeneca vaccine has been linked to rare, potentially fatal blood clots, prompting several provinces to recently limit its use as they await further research.
In a letter to her provincial and territorial counterparts, federal Health Minster Patty Hajdu encourages provinces that aren't able to get their AstraZeneca doses into people's arms by the end of the month to give them to provinces that can. The province will then continue to expand eligibility for second dose appointments based on date of first dose.
"I think some of them might have thought that a single dose was sufficient or must have been discouraged by myths and fabricated reports on social media", said Dr Samreen Ashraf Qureshi, provincial focal person for Covid-19 vaccination, emphasising that all vaccines were safe and effective. It already has an agreement with AstraZeneca to secure enough doses for 60 million people.