In this March 24, 2021, file photo, people stand in line outside a Northern Light Health COVID-19 vaccine clinic at the Portland Expo. Credit: Troy R. Bennett / BDN

A mass vaccine clinic at the Portland Expo will offer walk-in vaccinations on Wednesday.

The number of vaccine doses available for walk-ins will vary based on the weekly shipments to the clinic run by Northern Light Mercy Hospital, according to Ed Gilman, a spokesperson.

That clinic is open 9 a.m. to 3 p.m. Tuesdays through Fridays, and vaccine appointments can still be online or by calling 207-204-8551.