https://www.siliconvalley.com/2021/06/18/covid-its-not-just-delta-other-coronavirus-variants-worry-scientists-also/

(CNN) — Coronavirus variants are what keep Dr. Scott Lindquist, an epidemiologist for Washington state, up at night.

“I have got to be honest — last thing I think about before I go to bed are the variants and the first thing I think about in the morning are the variants,” Lindquist told a briefing this week.