Contact Tracing Dashboard - LA County Department of Public Health

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Contact Tracing Dashboard

Current data reflects cases and contacts associated with cases
reported through 11/16/2021. Report Analysis Date: 11/23/2021.
(Data updated weekly every Wednesday)
Revised definitions that are in alignment with CDC ELC Metrics definitions

Total Number of Cases Assigned to Interviewer


7-Day Period1 (100.0%)


Cumulative (100.0%)

Cases that had Follow-up Initiated Within 1 Day of Assignment2


7-Day Period1 (99.5%)


Cumulative (93.3%)

Assigned Cases that Completed the Interview


7-Day Period1 (46.0%)


Cumulative (44.5%)

Number of Contacts Identified through Case Interviews


7-Day Period1 (100.0%)


Cumulative (100.0%)

Contacts that had Follow-up Initiated Within 1 Day of Assignment3


7-Day Period1 (89.6%)


Cumulative (76.9%)

Contacts that Completed the Interview


7-Day Period1 (65.3%)


Cumulative (65.0%)

Case Processing

7-Day Period1Cumulative
Number of confirmed cases prior to contact tracing system deployment (before April 6, 2020)4n/a5,311
Number of confirmed cases after April 6 system deployment5 7,7331,442,838
Number of cases excluded6295117,975
Number of cases to be considered for case interview77,4381,324,863
— Duplicates4110,056
— Missing contact information86415,303
— Unassigned900
— Other1032,674
Total Number of Cases Assigned to Interviewer7,330 1,296,830
(1) Cases processed and uploaded into the contact tracing system from November 10, 2021 – November 16, 2021
(2) "Follow-up Initiated" means a telephone call was made to reach the case.
(3) "Follow-up Initiated" means a telephone call was made to reach the contact.
(4) Cases were uploaded to the contact tracing system starting April 6, 2020; earlier cases were tracked through a different process.
(5) Total number of cases is different than the reported current number of cases because cases are removed later if they are identified to be duplicates, out of jurisdiction, or false cases.
(6) Cases can meet more than one criterion and include cases at skilled nursing facilities, jails and prisons, and deceased people and persons with lab result dated 14 days prior to interview assignment.
(7) Data from the contact tracing system as of November 22, 2021. These numbers reflect cases uploaded to the system on from November 10, 2021 – November 16, 2021 and contacts elicited from those cases. Three attempts on three different days are made to reach each case and contact.
(8) Cases missing phone numbers or with invalid phone numbers and referred for DMV/Lexis Nexis search and closed if unable to be located. Starting on 10/19/2020, the addition of the invalid phone numbers resulted in a one-time only cumulative increase in the count.
(9) Cases pending interviewer assignment (e.g. cases with newly found phone numbers from DMV/Lexis Nexis search and interviewer staffing factors)
(10) Cases are excluded prior to interview assignment if they are identified to be residents of congregate settings (SNFs, correctional facilities), non-LA County residents, received more than 14 days post specimen collection or had lab errors (i.e., negative test results). Starting on 10/19/2020, this new exclusion resulted in a one-time only cumulative increase in the count.
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Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.

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