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Syringes with vaccines are prepared at the L.A. Care and Blue Shield of California Promise Health Plans' Community Resource Center where they were offering members and the public free flu and COVID-19 vaccines Oct. 28, 2022, in Lynwood, Calif. COVID-19's origins remain hazy. Three years after the start of the pandemic, it's still unclear whether the coronavirus that causes the disease leaked from a lab or spread to humans from an animal. (AP Photo/Mark J. Terrill, File)

Syringes with vaccines are prepared at the L.A. Care and Blue Shield of California Promise Health Plans' Community Resource Center where they were offering members and the public free flu and COVID-19 vaccines Oct. 28, 2022, in Lynwood, Calif. COVID-19's origins remain hazy. Three years after the start of the pandemic, it's still unclear whether the coronavirus that causes the disease leaked from a lab or spread to humans from an animal. (AP Photo/Mark J. Terrill, File)

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