Why experts say it's especially important for heart patients to get coronavirus vaccine
Susan Morrison, right, a medical assistant, gives the first dose of the Pfizer COVID-19 vaccine to Byron Saunders, left, Saturday, March 13, 2021, on the first day of operations at a mass vaccination site at the Lumen Field Events Center in Seattle, which adjoins the field where the NFL football Seattle Seahawks and the MLS soccer Seattle Sounders play their games. Saunders and his wife were among the first in line for their appointments at the site, which is the largest civilian-run vaccination site in the country, and will operate only a few days a week until city and county officials can get more doses of the vaccine. (AP Photo/Ted S. Warren)