Respiratory Viruses (COVID-19, Influenza, RSV) Data and Reports
Page last updated 11/2/2023.
- The Respiratory Virus
Surveillance Report summarizes current COVID-19, flu, and RSV
surveillance in San Diego County.
- This report is issued weekly on Thursdays from October through May, and issued monthly on the second Thursday of the month from May though October.
- Respiratory Virus Surveillance Annual Summary 2022-23.
- Respiratory Virus Surveillance Slide Deck Respiratory Virus Surveillance tables and graphs, for public use.
- Supplemental Information: Includes additional information on reporting, resources, data sources, and definitions.
1. Hospitalization data are from the National Healthcare Safety Network (NHSN). Hospitalization counts include all patients diagnosed with COVID-19 or influenza during their stay. This does not necessarily mean they were hospitalized because of COVID-19 or influenza complications or that they experienced symptoms. Includes residents and non-residents hospitalized at San Diego County hospitals. Bars are the daily census count and the line is the daily average based on a 7-day average.
2. Death data are from the California Vital Records Business Intelligence System (VRBIS). These are deaths where COVID-19, influenza, or RSV or an equivalent term is indicated in the immediate cause of death, underlying cause of death, or significant conditions contributing to death fields in death certificate data. For the purposes of respiratory virus surveillance, fiscal year 2023-24 is defined as July 2, 2023 - June 29, 2024 (aligned to include full weeks). Fiscal year-to-date includes known deaths with death dates through the most recent Saturday. 4-week average and rate calculations have a 21-day lag due to delays in reporting. Bars are the weekly number of deaths and the line is the weekly average based on a 4-week average.
3. Tests include residents and non-residents who tested in San Diego County. COVID-19 tests include molecular tests such as polymerase chain reaction (PCR) and other nucleic acid amplification tests (NAAT), while influenza and RSV tests include molecular tests and rapid antigen detection tests. Graphs include tests performed by COSD Public Health Laboratory, hospital, and commercial laboratories and reported via Electronic Laboratory Reporting (ELR) and line lists, and exclude invalid, indeterminate, and unsatisfactory results. Bars are the weekly total of tests performed and the line is the test positivity by week. Test positivity shown is for the most recent week.
Rates are calculated using 2021 population estimates from the San Diego Association of Governments.
Flu Season Summaries
- Influenza Surveillance - 2021-22 Season Summary
- Influenza Surveillance - 2020-21 Season Summary
- Influenza Surveillance - 2019-20 Season Summary
- Influenza Surveillance - 2018-19 Season Summary
- Influenza Surveillance - 2017-18 Season Summary
- Influenza Surveillance - 2016-17 Season Summary
- Influenza Surveillance - 2015-16 Season Summary
- Influenza Surveillance - 2014-15 Season Summary
For more information, contact the Epidemiology Unit at (619) 692-8499 or send us an e-mail.