BOSTON — There are five new presumptive positive coronavirus cases in Massachusetts, increasing the total number of presumptive cases to 12, according to the Massachusetts Department of Public Health.
The update from health officials came on Saturday. There remains just one confirmed case of COVID-19 in the state involving a UMass Boston student.
The 12 presumptive cases are reported based on local testing, but are still awaiting confirmation by the U.S. Centers for Disease Control and Prevention.
Those presumptive cases include three in Suffolk County, three in Norfolk County and one in Middlesex County.
State health officials have not yet released any details about the five new presumptive cases.
The presumptive positive patients in Suffolk County, all from Boston, are two women and one man in their 40s, said Boston Chief of Health and Human Services Marty Martinez. All three attended a recent conference that Cambridge-based Biogen held in Boston at the Marriott Long Wharf.
The individuals were identified by the company as having had contact with a person who became ill after the meeting, Martinez said.
"All are at home, self-isolating. Two of them have symptoms and one does not," Martinez said.
Martinez said health officials are tracing those who may have had contact with the presumptive cases.
About 175 people attended the meeting, which was held from Feb. 24-27. Related illnesses were previously reported in other attendees, including one person from Tennessee and two Europeans.
Two of the Norfolk County presumptive positive cases were also linked to the Biogen conference, according to Massachusetts Secretary of Health and Human Services Marylou Sudders. The third case in that county is a man in his 40s who recently returned from Italy.
The presumptive case reported in Middlesex County involves a woman in her 60s who also had recently traveled to Europe.