Delta Variant Supplemental Reference

The Department of Homeland Security (DHS) Science and Technology Directorate (S&T) developed the following Supplemental Reference (SR) to quickly summarize key information on the newly-emerged, highly infectious Delta variant of the SARS-CoV-2 virus, now responsible for the vast majority of new COVID-19 cases in the U.S. The Delta variant SR is intended to inform government decision-makers in the operational response to COVID-19 and the public of key differences observed in this strain and continued best practices. For a comprehensive guide to the current state of available information, readers are referred to the COVID-19 Master Question List.