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.

Highlights

  • 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 during the 2020–21 influenza season in the United States and Northern Hemisphere, after low levels were reported in the Southern Hemisphere during the 2020 season there

  • 258 positive influenza test results were reported to California Department of Public Health (CDPH) during September 1, 2020–April 30, 2021, in contrast to the >1.77 million COVID-19 cases reported by the 59 local health jurisdictions (LHJs) included in this analysis

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Summary

Introduction

The Study California laboratories and medical providers must report all positive and nonpositive (i.e., negative, inconclusive, or invalid) SARS-CoV-2 laboratory results to their local health jurisdictions (LHJs) [2]. Angeles and San Diego, which represent one third of California’s population, do not use CalREDIE directly; we excluded data from those LHJs. We matched positive molecular influenza test results reported during September 1, 2020–April 30, 2021, with positive and nonpositive molecular SARS-CoV-2 test results to identify co-infections.

Results
Conclusion

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