A 58-year-old woman, who had been treated as a suspected case of MERS, died of acute respiratory failure on Monday and tests later came back positive for the virus.

The other victim was a 71-year-old man who had been confirmed to have the virus several days ago. The Yonhap report did not say when the man died.

A local news agency today said that 25 people have now been diagnosed with the virus, the emergence of which has triggered
widespread public alarm.

Middle East Respiratory Syndrome is considered a deadlier but less infectious cousin of Severe Acute Respiratory Syndrome (SARS), which killed hundreds of people when it appeared in Asia in 2003.

South Korea's first case was reported on May 20 and the health ministry said Monday that a total of 682 people who were exposed directly or indirectly to the virus have now been quarantined or put under special observation.

More than 20 countries have been affected by the virus, which has no known cure or vaccine, with most cases in Saudi Arabia where it has claimed more than 400 lives since 2012.

The South Korean outbreak is the largest among countries outside the Middle East and President Park Geun-Hye has scolded health officials over their "insufficient" response to the outbreak.

Health officials were particularly criticised for allowing an infected man to travel to China last week despite warnings from doctors.

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