Boston Mayor Michelle Wu announced a plan Monday morning to implement a COVID-19 vaccine requirement for “select indoor public spaces,” due to the rising COVID-19 cases and to encourage vaccination.

“Vaccination is the most powerful tool we have to fight this pandemic,” Wu said during her announcement of the new requirement, called B Together Initiative.

Patrons will be required to show they have received at least one vaccine dose to enter indoor dining, bars, nightclubs, gyms and entertainment beginning January 15th. Proof of full vaccination will be required for adults by February 15th. They are also working on setting dates for children to be vaccinated to enter these spaces, which will begin in March.

All businesses affected will be required to place a sign at the front entrance and to check the customer’s vaccination proof upon entry. Employees of these businesses will also be required to have received their vaccines. Acceptable proof of vaccination will include a CDC vaccination card, a digital image of the card, an image of another official immunization record, or a COVID vaccine verification app. Wu’s administration stated that an app for Boston is in the works for this purpose.

See the full detailed list of covered locations here, as well as more details about the B Together Initiative.