coronavirus May 9, 2023 5:13 pm UCSF Researchers Study Degrees of COVID-19 Vaccine Protection When it comes to protection over time, some COVID-19 vaccines perform better than others, according to a UCSF study. Marianne Favro reports. US & World Videos 4:30 A closer look: New COVID variants lead to uptick in cases 2:19 San Francisco barbershop struggles to stay open after pandemic 0:51 Alameda County using dogs to detect COVID 3:57 Interview: Doctor's perspective on COVID 4 years after shutdown started 2:27 Marking 4 years since COVID-19 shut down the Bay Area