Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2021 Nov;27(11):2923-2926.
doi: 10.3201/eid2711.211129. Epub 2021 Sep 29.

Influenza and SARS-CoV-2 Co-infections in California, USA, September 2020-April 2021

Kyle R Rizzo, Cora Hoover, Seema Jain, Monica Sun, Jennifer F Myers, Brooke Bregman, Deniz M Dominguez, Allison Jacobsen, Garrett J Jenkins, Tamara Hennessy-Burt, Erin L Murray

Influenza and SARS-CoV-2 Co-infections in California, USA, September 2020-April 2021

Kyle R Rizzo et al. Emerg Infect Dis. 2021 Nov.

Abstract

During September 1, 2020-April 30, 2021, the California Department of Public Health, Richmond, California, USA, received 255 positive influenza molecular test results that matched with severe acute respiratory syndrome coronavirus 2 molecular test results; 58 (23%) persons were co-infected. Influenza activity was minimal in California, and co-infections were sporadic.

Keywords: COVID-19; California; SARS-CoV-2; United States; co-infections; coronavirus disease; influenza; respiratory infections; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.

PubMed Disclaimer

Figures

Figure 1
Figure 1
Matching process of influenza and SARS-CoV-2 molecular test results submitted to CalREDIE, California, USA, September 1, 2020–April 30, 2021. CalREDIE, California Reportable Diseases Information Exchange; DOB, date of birth; personID, CalREDIE individual identification cod SARS-CoV-2, severe acute respiratory syndrome coronavirus 2
Figure 2
Figure 2
Number of influenza infections (n = 258) and co-infections with SARS-CoV-2 (n = 58) by week of onset, California, USA, September 1, 2020–April 30, 2021. SARS-CoV-2, severe acute respiratory syndrome coronavirus 2.
See this image and copyright information in PMC

References

    1. Immunization Branch, California Department of Public Health. Influenza surveillance program: flu reports [cited 2021 Feb 24]. https://www.cdph.ca.gov/Programs/CID/DCDC/pages/immunization/flu-reports...
    1. California Code of Regulations. Notification by laboratories 17 CA ADC § 2505 [cited 2021 Mar 1]. https://www.cdph.ca.gov/Programs/CID/DCDC/CDPH%20Document%20Library/LabR...
    1. Centers for Disease Control and Prevention. Weekly U.S. influenza surveillance report [cited 2021 Feb 4]. https://www.cdc.gov/flu/weekly/index.htm
    1. World Health Organization. Influenza laboratory surveillance information [cited 2021 Feb 4]. https://apps.who.int/flumart/Default?ReportNo=5&Hemisphere=Northern
    1. California Open Data Portal. Clinical sentinel laboratory influenza and other respiratory virus surveillance data by region and influenza season [cited 2021 Jul 13]. https://data.ca.gov/dataset/influenza-surveillance/resource/d2207905-14e...

Publication types