How many new COVID-19 cases does San Diego County have as of March 16? More than 722,000 -- or 26.9% of San Diego County residents over the age of 16 -- have received at least one dose of the two-shot vaccines. Author: City News Service Updated: 6:58 PM PDT March 16, 2021 SAN DIEGO COUNTY, Calif. — Restaurants, movie theaters, fitness centers and other businesses will be able to resume indoor activities tomorrow with San Diego County advancing into the less-restrictive red tier of the state's COVID- 19 reopening blueprint. The state confirmed the move Tuesday when it reported the county's new daily COVID case rate was 6.8 per 100,000 population, the second consecutive week with a sub-10 per 100,000 number, allowing for the shift to the red tier. The rate last week was 8.8 per 100,000 residents.