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SAN DIEGO — Early this week, COVID-19 vaccines are available without appointments at two sites in San Diego County.

Health leaders say 800 Pfizer vaccines are available at the Border View YMCA on Monday and Tuesday. An additional 600 Pfizer doses will be given out at the Mountain View Educational Cultural Complex on Tuesday. Both sites are open from 9:30 a.m. to 3:30 p.m.

The county said San Diegans must be in groups currently eligible for the vaccine in order to receive a no-appointment dose. They are first come, first served.

Health leaders offered no appointment walk-up vaccines at three sites last week after a glitch with the MyTurn online scheduling site. The vaccines were available while supplies lasted at Viejas Arena at San Diego State University, Lemon Grove Community Center and East County Public Health Center in El Cajon.

More than 1.1 million county residents have received at least one dose of the two-dose vaccines and 25.3%, or some 681,000 people, are fully vaccinated, according to the county.

This week also marks a major expansion of vaccine eligibility in the state. Starting Thursday, all Californians ages 16 and older become eligible to receive a vaccine. It is the second such expansion this month after state leaders opened up the vaccine to residents ages 50 and up on April 1.

Upon getting his vaccine earlier this month, Gov. Gavin Newsom said that while supplies still remain limited, “our statewide network of providers is ready to meet the growing demand.”

Those supply limitations have led the vaccination super station at the Del Mar Fairgrounds to close on and off in recent weeks, including several days this week due to a low number of doses delivered last week to Scripps Health.

Vaccination information including how to schedule an appointment is available online at coronavirus-sd.com/vaccine.