Updated data on COVID cases among vaccinated and unvaccinated individuals

Data continues to show that vaccines are highly effective in preventing severe illness, hospitalization, and death.

The updated COVID-19 data shows cases rising due to the highly infectious Delta variant, including breakthrough cases among vaccinated individuals. However, the data continues to demonstrate that vaccines are highly effective in preventing severe illness, hospitalization, and death.

San Francisco is one of the highest vaccinated cities in the world with 81% of the eligible population fully vaccinated, and breakthrough cases are expected.

Unvaccinated people in the data presented include those who are not fully vaccinated. Cases are considered fully vaccinated if their positive COVID-19 test was 14 days or more after they received their 2nd dose in a 2-dose COVID-19 vaccine series or the single dose of a 1-dose vaccine.

Vaccine information

  • Vaccinated people are highly unlikely to be hospitalized due to COVID-19.
  • Cases are considered fully vaccinated if their positive COVID-19 test was 14 days or more after they received their 2nd dose in a 2-dose COVID-19 vaccine series or the single dose of a 1-dose vaccine.
  • No vaccine offers 100% protection from infection, but all three authorized vaccines are effective at preventing serious disease.
  • Based on clinical studies, breakthrough infections are to be expected but hospitalization due to COVID-19 is rare.
  • Testing positive for COVID-19 after being fully vaccinated does not mean the vaccine isn’t working, it just means that a person was exposed and the immune system responded.
  • The vaccine’s job is to promote a healthy immune response. In other words, if you are fully vaccinated and contract the virus, your symptoms will most likely be mild, similar to the common cold.

Cases (as of 09/17/2021)

The data on cases by vaccination status are estimates based on verifications of San Francisco case data matched to California Immunization Registry (CAIR2) vaccine data. The 7-day rolling average among fully vaccinated individuals and not fully vaccinated individuals shows the trend in new cases. We calculate the rolling average by averaging the new cases for a particular day with the prior 6 days.

  • 7-Day Rolling Average of Case Rate: 10.0 per 100,000 SF residents
  • 7-Day Rolling Average of Case Rate- Not Fully Vaccinated: 17.4 per 100,000 SF residents who are not fully vaccinated
  • 7-Day Rolling Average of Case Rate- Fully Vaccinated: 7.2 per 100,000 SF residents who are fully vaccinated
SF daily new case rate as of September 17, 2021.

Hospitalizations (as of 09/17/2021)

  • 77 clinically validated fully vaccinated San Franciscans who have ever been hospitalized due to COVID-19.
  • Case-based Hospitalization Rate- Not Fully Vaccinated: 85.7 per 1,000 cases
  • Case-based Hospitalization Rate- Fully Vaccinated: 12.1 per 1,000 cases
Hospitalizations per 1,000 cases as of September 17, 2021.

Deaths due to COVID-19 (as of 09/17/2021)

  • There have been 11 deaths of fully vaccinated people that are due to complications from COVID-19.

 

Last updated September 22, 2021