Michigan is seeing a spike in COVID-19 cases and hospitalizations. New Hampshire, Minnesota, and other states in the Midwest and Northeast are also seeing cases climb.
This surge is the delta variant, which began well before the new variant omicron was detected in the U.S. just this week.
Dr. Angela Rasmussen explains what’s behind the latest surge and what we know — and don’t know — about the omicron variant.
This article was originally published on WBUR.org.