The United Nations on Monday expressed fears at what it called a “rapidly worsening” outbreak of cholera in war-ravaged Yemen, with more than 40,000 suspected cases since October, mainly in areas controlled by Houthi rebels. “We are also deeply concerned about a rapidly worsening cholera outbreak. 40,000 suspected cases and over 160 deaths have so far been reported — a sharp increase since our update last month,” UN humanitarian chief Martin Griffiths said. “The majority are in Houthi-controlled areas, where hundreds of new cases are reported every day,” Griffiths told the Security Council. I…