Baltimore City Chamber of Commerce issued the following announcement on March 14.
Baltimore City reported its first case of the novel coronavirus Saturday night as the pandemic continues to spread across Maryland and the U.S. Mayor Bernard C. "Jack" Young identified the patient as a man in his 60s, whose case is currently under investigation by the city health department. No additional details have been released. "I want all residents of Baltimore City to rest assured that the city has been preparing for this eventual outcome for more than a month and we are well-suited to respond.
Original source can be found here.
Source: Baltimore City Chamber of Commerce