Japan started monitoring travelers from South Korea more closely Thursday to keep the regional outbreak of Middle East Respiratory Syndrome at bay, while businesses began taking precautions.

The potentially deadly coronavirus has so far caused four deaths and infected dozens in South Korea. Some Japanese companies have put off business trips to the affected areas, and orders for antibacterial products are once again on the rise.

As part of the health ministry's steps, passengers from South Korea will be asked at quarantine stations in airports and ports if they have come in contact with patients suspected of contracting the virus. Similar steps were taken to deal with the international outbreak of the deadly Ebola virus last year.