A Republic of Korea hospital suspended most services on Sunday after being identified as the epicenter of the spread of a deadly respiratory disease that has killed 15 people since being diagnosed in the country nearly four weeks ago.

The World Health Organization has called an emergency meeting for Tuesday on the ROK's "large and complex" outbreak of Middle East respiratory syndrome, the biggest outside Saudi Arabia, where it was first identified in humans in 2012.

MERS was diagnosed in the ROK on May 20 in a businessman who had returned from a trip to the Middle East and has spread through hospitals.

It has stirred fears of a repeat of a 2002-03 outbreak of severe acute respiratory syndrome, which began in China and killed about 800 people globally.

The ROK Ministry of Health reported seven new cases on Sunday, taking the total to 145, as a 15th person died, an official in Busan said.

The people who died were all elderly or people with existing ailments.

The Samsung Medical Center, a prominent hospital in the capital, said it was suspending all non-emergency surgery and would take no new patients to focus on stopping MERS after more than 70 cases were traced to it.

Its tally has surpassed the number at a hospital in Pyeongtaek, where the first patient sought treatment.

Among the cases at the Samsung Medical Center was an emergency ward orderly who worked for days after developing symptoms, coming into contact with more than 200 people, the hospital said.

"We apologize for causing great concern as Samsung Medical Center became the center of the spread of MERS," the hospital's president, Song Jae-hoon, said at a news conference.

"This is entirely our responsibility and failing as we did not properly manage emergency-room staff."

The orderly is believed to have picked up the virus from an infected person who waited three days in different parts of the emergency ward, with nearly 900 staff members, patients and visitors coming and going.

All of the ROK's cases are believed to be linked to hospitals or related services and have been traced back to the businessman who returned from the Middle East.

The WHO said on Saturday it saw no sign the disease was spreading in the community, and there was also no indication the virus in the ROK was mutating into one more easily passed between people.

But it said ROK should anticipate more cases and recommended stepped up disease control and prevention measures.

(China Daily 06/15/2015 page11)