COVID-19 vaccine doses on Monday, though some regions said a lack of supply meant they couldn’t offer second shots to the oldest seniors right away.The government announced last week that it was shortening the intervals between doses, starting with the 80 and older cohort this week, but left it up to individuals to schedule earlier shots.Some said they were able to quickly move up appointments for their loved ones on Monday morning.Karthik Kanagas said he was able to move his father’s second-dose up to Wednesday — far earlier than the original appointment booked for July at a Toronto clinic.