Virus Mutation and a Bad Vaccine Batch Fifth & Mission

Just as California tries to turn the corner on the coronavirus pandemic, a new variant is spreading, and it might be even more contagious. Meanwhile, thousands of vaccine doses are shelved after several people who were inoculated at a site in San Diego report serious allergic reactions. Reporters Catherine Ho and Erin Allday have details. | Unlimited Chronicle access: sfchronicle.com/pod
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