South Korea says a fourth person has died from Middle East Respiratory Syndrome (MERS), as an infected doctor fuelled fears of a fresh surge in cases and prompted Seoul’s mayor to declare “war” on the virus. Five new cases overnight took the number of infected people to 41 in what has become the largest MERS outbreak outside Saudi Arabia, with close to 2,000 people in quarantine or under observation. The latest fatality was a 76-year-old male patient who died on Thursday after testing positive for the virus on May 21, reports AFP. More than 1,000 schools, from kindergartens to colleges, have temporarily shut down across the country, while the government’s MERS hotline has been taking thousands of calls a day.