An illustration of the new coronavirus that causes the disease COVID-19. Image courtesy of the Centers for Disease Control.

Gov. Charlie Baker updated state employees on ongoing efforts in Massachusetts to prepare for the new coronavirus and prevent the spread of the illness, advising them to speak with their managers if they have any concerns and to “practice good personal hygiene.”

“We have been working with our federal and local partners daily as we build on our existing plans to deal with this virus, and we will adapt when need be to keep people safe,” Baker wrote in a message to state workers Monday night. “Yes, it is very contagious, but it is also not a danger to the vast majority of the people who do catch it. The threat in the U.S. and the threat in Massachusetts at this time remain low, and our constant surveillance efforts and ongoing dialogue with the health care, infectious disease and public health experts here in Massachusetts will ensure we make appropriate adjustments along the way.”

Also Monday night, the Department of Public Health announced that testing at the state laboratory had identified a “presumptive positive” case of the illness known as COVID-19, in a Norfolk County woman in her 20s who was displaying symptoms after recent travel to Italy with a school group. If confirmed by the Centers for Disease Control and Prevention, it would mark the second COVID-19 case in Massachusetts since the outbreak began in the U.S. in January.

Massachusetts public health officials have tested 12 residents for the virus, including the Boston man who was the state’s first case. Officials say he is recovering.