Four Michigan counties are facing risk of “accelerated spread” of coronavirus, based on current infection rates, while 12 other counties are in the green zone, based on a metric developed by the Harvard Global Health Institute.
Most Michigan counties -- the remaining 67 -- are the “yellow” zone, using the Harvard institute’s metric. That means the per-capita number of new cases is high enough to be on alert, but low enough that a full or partial lockdown is unnecessary for now.