On Monday, the COVID-19 Vaccine Distribution Task Force outlined who gets COVID-19 vaccines first.
Health-care professionals analyzed 31,917 samples December 4.
Ontario initially said it would develop its vaccine plan by year's end, but last week Ford said the province would be ready even if the vaccines arrive sooner.
The change to orange includes restrictions on visitors to long-term care homes and beefed up testing in the facilities.
Elliott has said Ontario will receive 1.6 million doses of the new vaccine from Pfizer and 800,000 doses from Moderna in early 2021.
"We know we will have more demand in those two groups than we will have vaccines to satisfy, so we can't do it all at once".
Despite rising infection rates, York Region, which saw 249 new COVID-19 cases on Sunday, has managed to avoid entering the "grey" or "lockdown" zone of the province's reopening framework.
"Our priority continues to be the health and safety of all Ontarians, so we will make sure that no matter where they are receiving a vaccine, they will have a fast and safe immunization experience".
Hillier said that Phase 2 will likely begin around April and will take approximately six to nine months to complete.
Tam said the prospect of an imminent vaccine should be encouraging, but said recent troubling numbers reinforce the need for ongoing adherence to public health protocols meant to stem the spread of the virus.
The government's says their approach is informed by science and prioritizes population groups that are at greatest risk of COVID-19.
As further information is made available about the various type of vaccines and availability of doses, additional details related to the implementation of the COVID-19 immunization program will be provided based on the latest medical advice and scientific evidence.
Ontario would then transition to Phase 3, which Hillier describes as a "steady state".