At least 52 cases of cholera have been reported in parts of the Tanzanian commercial capital, Dar es Salaam, over the last month, a city official said on Tuesday (January 10). "We are worried over more new cases although we have warned the people to adhere to rules of hygiene, including boiling drinking water, use of toilets and washing hands with soap," Gaston Makwembe, the Dar es Salaam City Information Officer, said.