Respiratory Viruses (COVID-19, Influenza, RSV) Data and Reports 

Page last updated 2/1/2024.

This webpage provides data and reports about respiratory viruses that can cause cold and flu-like symptoms, including COVID-19, Influenza (Flu), and Respiratory Syncytial Virus (RSV)

For other reportable diseases and conditions in San Diego County, visit Data and Reports. For COVID-19, visit COVID-19 in San Diego

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Respiratory Virus Surveillance Report

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  • Data Notes

    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 2022 population estimates from the San Diego Association of Governments.

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Flu Season Summaries

For more information, contact the Epidemiology Unit at (619) 692-8499 or send us an e-mail.