A Detroit resident is tested for free for the coronavirus disease (COVID-19) and antibodies at the Sheffield Center in Detroit, Michigan, April 28, 2020.
Rebecca Cook | Reuters
Coronavirus cases in the Midwest are beginning to increase following warnings from top U.S. health officials that the country’s heartland could be vulnerable to new outbreaks.
Coronavirus cases were growing by 5% or more, based on a weekly average to smooth out daily reporting, in 21 states and Washington D.C. as of Saturday, according to a CNBC analysis of data collected by Johns Hopkins University, an increase from 12 states on Monday.
Several Midwestern states were among those reporting growing cases—…