OLYMPIA—The Department of Health is collaborating with Safeway Inc. and Albertsons Companies LLC to offer no-cost influenza (flu) vaccination for uninsured adults over the age of 18 to help prevent flu illness during the COVID-19 pandemic. Health officials are concerned that the presence of both viruses could put more people in the hospital and strain Washington’s health care system.

Twenty-three Albertsons and Safeway pharmacies across the state will offer the flu vaccine free of charge through June 2021 to uninsured adults. The pharmacies will not charge an administration fee, and no proof o...