The residual COVID-19 public health threat primarily affects 10-20 million Americans lacking natural or vaccinated immunity, who are at significant risk of hospitalization and ventilation.

“one is the sort of residual covid19 public health threat which is mostly delta but it's the virus infecting the 10 to 20 million american americans who are still at significant risk these are adults who have no natural immunity and no vaccinated immunity and they continue to show up in the hospital and go on ventilators”