If you're among the thousands of Bay Area residents who've skipped the second shot of a two-shot vaccine, you've got health experts worried. You may be better off than people who are fully unvaccinated, but you're at risk of getting sick, especially from the potent "delta" variant, according to new research. Chronicle health reporter Catherine Ho talks about people who haven't returned for second doses, and what officials are doing in response. | Unlimited Chronicle access: sfchronicle.com/pod

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