The first of millions of expected vaccine doses needed to extinguish the COVID-19 virus arrived in Oregon Monday, starting a process that could last into fall 2021.

The Oregon Health Authority issued a statement that the first doses of the vaccine manufactured by Pfizer arrived in the state at 7 a.m. Monday. Four facilities in or near Portland, along with a medical center in Ontario in Malheur County, will each receive 975-dose packages by Tuesday.