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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 5

Trends of weekly 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 weekly Los Angeles County sentinel laboratory SARS-CoV-2 percentage positivity during July 6, 2020–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. Pearson correlation coefficient = 0.762. Scales for the y-axes differ substantially to underscore patterns but do not permit direct comparisons. CLI, COVID-like illness.

Figure 5. Trends of weekly 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 weekly Los Angeles County sentinel laboratory SARS-CoV-2 percentage positivity during July 6, 2020–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. Pearson correlation coefficient = 0.762. Scales for the y-axes differ substantially to underscore patterns but do not permit direct comparisons. CLI, COVID-like illness.

Main Article

Page created: September 23, 2025
Page updated: December 10, 2025
Page reviewed: December 10, 2025
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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