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

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

• California
• co-infections
• coronavirus disease
• COVID-19
• influenza
• respiratory infections