Respiratory Virus Hospital Admissions Over Time

C. UPDATE PROCESS The dataset is updated every Friday and includes data from the previous Sunday through Saturday. For example, the update on Friday, October 17th will include data through Saturday, October 11th. Data may change as more current information becomes available.

D. HOW TO USE THIS DATASET Weekly data represent a count of confirmed admissions of Influenza, RSV, and COVID-19 patients to San Francisco hospitals by week. The admission rate per 100,000 is calculated by multiplying the count of admissions each week by 100,000 and dividing by the population estimate. Respiratory virus activity levels are based on a California Department of Public Health (CDPH) definition which uses 5 prior seasons of data, these are defined below: COVID-19: Very Low 28.

Influenza: Very Low 9. RSV: Very Low 2.1. Trend indicators are also included to describe whether the positivity hospitalization rate for each respiratory virus is increasing, decreasing, or stable compared to the previous week.

Weekly trend status (Increasing / Decreasing / Stable) for respiratory virus hospitalization rates is determined using a threshold framework adapted from CDC's national FluView methodology, recalibrated using San Francisco–specific historical data. A week is classified as Increasing or Decreasing when the following condition is met: COVID-19: if the hospitalization rate changes by at least 0.3 from the previous week Influenza: if the hospitalization rate changes by at least 0.25 from the previous week RSV: if the hospitalization rate changes by at least 0.2 from the previous week If the condition is not met, the week is classified as Stable.

E. ARCHIVED DATA A previous version of COVID-19 Hospital Admissions Over TIme dataset was archived. For historical purposes, you can access the archived dataset here .