Los Angeles residents scrambling to book vaccination appointments by refreshing their web browsers and flooding hotline numbers are out of luck. By Monday, most appointments on city and county-run websites were taken for the week.

It took just 10 minutes for thousands of reservations to get snapped up on L.A. city's appointment site run by Carbon Health last week.

"The experience has been a little bit like trying to get Rolling Stones tickets," said Sujal Mandavia, the chief medical officer of the San Francisco-based company.

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