coronavirus July 29, 2021 11:06 pm COVID-19 Vaccine Booster Trials Underway Nationwide A COVID-19 booster shot could be a part of your future soon. The makers of Pfizer is involved in a nationwide trial to study the effects of a third shot. Cheryl Hurd reports. US & World Videos 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 2:09 CDC updates COVID isolation guidelines
