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SAN DIEGO — The San Diego Fire-Rescue Department expects to administer the Johnson & Johnson coronavirus vaccine beginning Tuesday.

SDFD was accepting appointments for the single-dose shots for eligible San Diegans from March 9-12. As of 2 p.m., all of the appointments had been claimed.

The first shipments of the newly-approved Johnson & Johnson vaccine went out last week. Johnson & Johnson said the company plans to distribute 100 million doses of its vaccine to the U.S. by the first half of 2021. It will be the first single-dose vaccine available in the U.S.

Vaccine supply continues to be a problem in San Diego County with three sites seeing closures on Sunday — the Linda Rhoades Recreation Center in Vista, Border View YMCA in Otay Mesa and the Lemon Grove Community Center. The Del Mar super vaccination site was closed Saturday because of delays with Pfizer shipments.

Supervisor Nathan Fletcher said he is hopeful that with the additional option of a Johnson & Johnson vaccine, the vaccination pace will pick up.