How hantavirus causes severe illness

It’s been an ordeal for those who embarked on a cruise across in early April and it’s not over yet. 

The ship's passengers are being repatriated across the world after potential exposure to hantavirus, which caused the death of three passengers. 

Among those heading home are four Australians who will soon be placed in a quarantine facility in Western Australia. 

What is the virus, how does it spread and should we be worried about it?  

Today epidemiologist Raina MacIntyre from UNSW on everything you need to know about hantavirus. 

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Raina MacIntyre, epidemiologist and Professor of Global Biosecurity at the University of New South Wales