From your link:
"...CNN contributor and University of Massachusetts Dartmouth Biology Professor Erin Bromage called the growing rate of Covid-19 cases amongst younger people a "smoldering fire" that will hit vulnerable populations.
"We're now seeing what is really happening, which is those 18- to 44-year-olds are being affected at a really high rate," Bromage said. "Their social networks, their employment, is allowing them to mix at a higher rate, and we're seeing the infection rate -- especially in Texas, Florida and Arizona -- just skyrocketing in that demographic."
"...as more of them get infected, the chance of them interacting with the vulnerable population increases and hits that vulnerable population, and then the inferno just begins," Bromage told CNN's John Berman."