The number of coronavirus cases in Massachusetts hit 41 on Monday, according to new Department of Public Health figures that also show four of those people have been hospitalized for their symptoms.

Thirty-two of the COVID-19 cases are related to the Biogen employee conference held in Boston in late February, four others are travel-related and the remaining five are under investigation, the DPH said.

By county, 15 of the cases are in Middlesex County, 10 each in Suffolk and Norfolk counties, five are in Berkshire County, and one is in Worcester County.

Of the 41 one cases, still only one has been confirmed by the Centers for Disease Control and Prevention -- the rest are considered "presumptive positive" after being tested by the state laboratory.

The department's numbers did not indicate which four patients were hospitalized. Eighteen of the people who have tested positive for the illness are female and 23 are male.