AFP, SEOUL: South Korea reported yesterday a fourth death 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 Thursday after testing positive for the virus on May 21. Criticised for its lack of transparency in addressing the health scare, the Health Ministry finally confirmed the name of the hospital where the first patient to be diagnosed with MERS was treated. The ministry said anyone who had visited the hospital in Pyeongtaek, about 65 kilometres (40 miles) south of Seoul, between May 15-29 should report to a clinic for screening. The government had initially declined to name any hospitals treating cases of MERS, for which there is no vaccine or cure, arguing it could cause them unfair commercial losses. Of particular concern was the positive test of a doctor at a major Seoul hospital who was understood to have taken part in public meetings attended by up to 1,500 people while infectious.