HAVANA — Cuba’s Public Health Ministry acknowledged on Tuesday 51 new cases of cholera in the capital amid growing concerns about the spread of the illness and disappointment in the diplomatic community over the government’s lack of transparency.

The ministry said nobody had died from the latest outbreak, which began Jan. 6, and stressed that preventive measures already taken had put the disease ‘‘on the way to extinction.’’ It said cholera was first detected in the capital’s Cerro neighborhood, and then spread elsewhere. No other areas of the capital were mentioned, but there have been reports of cases in the leafy Playa neighborhood that is home to many foreign embassies.