The number of COVID-19 deaths per 100,000 residents in all nine Bay Area counties in the last three major waves of infection. The date range for the omicron wave is Jan. 1 2022 through March 7 2022, the date range for the delta wave is Aug. 1, 2021 through Oct. 15, 2021 and the date range for the winter 2020-2021 wave is Nov. 10 2020 through March 31, 2021.