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As California increases COVID-19 vaccinations, supply issues are becoming a critical problem, and some counties say they are rapidly running out.

County officials say they have most of the resources — large vaccine centers and personnel to run them — but lack the doses they need.

“Our ability to protect even more L.A. County residents in the coming weeks and months is entirely dependent and constrained by the amount of vaccine we receive each week, and often, we do not know from one week to the next how many doses will be allocated to L.A. County,” Public Health Director Barbara Ferrer said in a news conference Wednesday.

Those 65 and over are vying for appointments and have endured long lines to get their shots. But officials warn that a shortage in supplies could delay how quickly the state is able to vaccinate older Californians before moving onto other groups not currently prioritized.

Read the full story on LATimes.com.