Sellick Explains Why the Delta Variant Is So Contagious

Updated August 4, 2021

Multiple news outlets reached out to John A. Sellick Jr., DO, professor of medicine in the Division of Infectious Diseases, for help explaining why the Delta variant is so dangerous. The Delta variant has several mutations on its spike protein, the crown-like piece of the virus that latches onto a person’s cells, he said. Thus, Delta “binds very tightly,” compared to other variants, Sellick said, allowing it to “stay attached very well” once it gets ahold of cell receptors.”