South Korea's Health Ministry has confirmed five additional cases of Middle East Respiratory Syndrome, or MERS.
It raises the country's total number of recorded infections to 35, including two more health care workers who treated infected patients.
Four deaths have been directly linked to MERS.
All the cases have been traced to a 68-year-old man who had visited Saudi Arabia and the United Arab Emirates, the countries with the most confirmed MERS cases.
So, what is MERS, what are the symptoms and how do you catch it?
Charmaine Wong asks Gary Crameri, a research scientist at CSIRO.
(Click on the audio tab above to hear the full interview)
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