INFLUENZA WATCH - Los Angeles County Department of Public Health
INFLUENZA WATCH
Summary of Los Angeles County Department of Public Health (LAC DPH) Influenza and Other Respiratory Disease Surveillance
Updated 12-4-2020 MMWR Week: 48 Ending on: 11-28-2020
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Influenza Surveillance at a Glance
Virology
Illness
Severe Disease
0% of specimens tested at Los Angeles sentinel surveillance laboratories* in week 48 were
positive for Influenza.
This season, more Influenza B has been detected than Influenza A.
Visits for influenza-like illness accounted for 3% of
emergency department visits in week 48, which is
more than in week 47.
Pneumonia, influenza, and COVID-19 accounted for 19%
of all deaths registered in LAC during week 48, which is
less than in week 47.
No influenza associated deaths have been reported
yet season.
* See indicator specific sections for associated methods.
Los Angeles County Department of Public Health (DPH) prepares this newsletter to summarize current influenza surveillance data in Los Angeles County. Weekly surveillance data are preliminary and subject to change. More information regarding methods can be
found on the surveillance system specific pages of this report.
COVID-19 surveillance data is published in the weekly COVID Watch surveillance report. Daily counts of COVID cases and deaths are available on the LAC DPH website at .
* LAC DPH surveillance data excludes the cities of Long Beach and Pasadena. ** The respiratory virus surveillance period starts with MMWR week 40 and runs through week 39 of the following year. The
2020-21 season started on Sept 27, 2020.
Los Angeles County Department of Public Health Acute Communicable Disease Control (213) 240-7941 publichealth.
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INFLUENZA WATCH
Summary of Los Angeles County Department of Public Health (LAC DPH) Influenza and Other Respiratory Disease Surveillance
Virologic Surveillance
Sentinel Surveillance Laboratories
Viral surveillance data is provided by clinical laboratories serving hospitals and healthcare networks across Los Angeles County. Participating laboratories provide the number of positive tests and total number of specimens tested for SARS-CoV2, influenza and respiratory syncytial virus.
Influenza Positive Specimens Percent Positive
Figure 1. Respiratory Specimens Tested and Percent Positive for Influenza Virus by LAC Sentinel Surveillance Laboratories, 2020-21 Influenza Season
100
50%
90
45%
80
40%
70
35%
60
30%
50
25%
40
20%
30
15%
20
10%
10
5%
0
0%
9/27/20 10/11/20 10/25/20
11/8/20 11/22/20
12/6/20 12/20/20
1/3/21 1/17/21 1/31/21 2/14/21 2/28/21 3/14/21 3/28/21 4/11/21 4/25/21
5/9/21 5/23/21
6/6/21 6/20/21
7/4/21 7/18/21
8/1/21 8/15/21 8/29/21 9/12/21 9/26/21
Influenza A
Week Ending
Influenza B
TOTAL FLU % POS
Baseline*
*The baseline is defined as the mean percentage of specimens testing positive during non-influenza weeks for the previous three seasons plus two standard deviations. Non-epidemic weeks are periods of 2 consecutive weeks during which each week accounted for ................
................
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