coronavirus February 1, 2021 5:18 pm Variant Concerns Continue Amid Race to Vaccinate As coronavirus vaccinations ramp up across the state, so do concerns about the variants. NBC Bay Area’s Janelle Wang speaks with Dr. Nadine Burke Harris to learn the latest. US & World Videos 4:02 Updated COVID vaccines coming 3:17 Slight summer uptick of COVID cases in California 3:57 Interview: Doctor's perspective on COVID 4 years after shutdown started 2:09 CDC updates COVID isolation guidelines 1:37 Study examines effectiveness of main COVID treatment Paxlovid