Why another COVID surge could hit the Bay Area in the months ahead
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1of3Mostafa Hallaji, owner operator Pollo's, cleans tables and chairs with alcohol as he prepares for re-opening after Alameda County was moved to the red tier on Tuesday, March 9, 2021 in Oakland, Calif.Lea Suzuki / The ChronicleShow MoreShow Less
2of3John Swartzberg, an infectious disease expert at the UC Berkeley school of public health, sits for a portrait inside his home office at his home in Lafayette, Calif, on Friday, March 27, 2020.Michael Short / Special to The Chronicle 2020Show MoreShow Less
3of3Dr. Peter Chin-Hong enters UCSF Medical Center on Friday, April 3, 2020, in San Francisco. Dr. Chin-Hong and fellow UCSF physicians are using Twitter to help educate the public about the frightening and evolving coronavirus outbreak.Noah Berger / Special to The Chronicle 2020Show MoreShow Less