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The Maine Center for Disease Control and Prevention has confirmed that Penobscot County is the third county in the state where the coronavirus is circulating via community transmission.
That means the virus is circulating among people who have not traveled to other places that have seen outbreaks of the virus or are not in regular contact with other people known to be infected. The other two counties with community transmission are Cumberland and York.
A total of 33 cases of the virus had been reported in Penobscot County as of Friday.
There are two criteria for establishing community transmission: at least 10 confirmed cases and that at least 25 percent of those are not connected to either known cases or travel.
Watch: Nirav Shah on tracing the origins of coronavirus cases in Maine