All eligible adults in Ontario can book COVID-19 booster shots starting Monday, December 20, as part of an accelerated rollout of third doses that will be the centrepiece of the province’s response to the highly infectious Omicron variant. Eligibility for boosters was shortened from six months to three months — or 84 days — from a person’s second vaccine dose. That time frame will apply to all newly eligible people 18 or older.
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