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Volume 31, Number 11—November 2025

Research

Community-Driven, Text Message–Based COVID-19 Surveillance System, Los Angeles County, California, USA, 2020–2024

Jordan B. Braunfeld, Elizabeth Traub, Howard Chiou, Aryana T. Amoon, Christina Collins, Allison Joyce, Justin Buendia, Prabhu Gounder, and Annabelle de St. Maurice
Author affiliation: Centers for Disease Control and Prevention, Atlanta, Georgia, USA (J.B. Braunfeld); Los Angeles County Department of Public Health, Los Angeles, California, USA (J.B. Braunfeld, E. Traub, H. Chiou, A.T. Amoon, C. Collins, A. Joyce, J. Buendia, P. Gounder, A. de St. Maurice)

Main Article

Figure 6

Trends of smoothed CLI response rate to the Angelenos in Action community-driven, text message–based COVID-19 surveillance system used in Los Angeles County, California, USA, 2020–2024, and trimmed and smoothed Los Angeles County SARS-CoV-2 RNA wastewater concentrations during January 9, 2022–April 6, 2024. A response was designated as a CLI if the respondent indicated they were sick and answered yes to both symptom-specific questions. Concentrations are normalized against values of a ubiquitous virus to account for stool flow rates and then multiplied by a factor of 106 (data not shown). Pearson correlation coefficient = 0.861. CLI, COVID-like illness.

Figure 6. Trends of smoothed CLI response rate to the Angelenos in Action community-driven, text message–based COVID-19 surveillance system used in Los Angeles County, California, USA, 2020–2024, and trimmed and smoothed Los Angeles County SARS-CoV-2 RNA wastewater concentrations during January 9, 2022–April 6, 2024. A response was designated as a CLI if the respondent indicated they were sick and answered yes to both symptom-specific questions. Concentrations are normalized against values of a ubiquitous virus to account for stool flow rates and then multiplied by a factor of 106 (data not shown). Pearson correlation coefficient = 0.861. CLI, COVID-like illness.

Main Article

Page created: September 23, 2025
Page updated: November 26, 2025
Page reviewed: November 26, 2025
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